(function (factory) {
    /* global define */
    if (typeof define === 'function' && define.amd) {
        // AMD. Register as an anonymous module.
        define(['jquery', 'codemirror'], factory);
    } else {
        // Browser globals: jQuery, CodeMirror
        factory(window.jQuery, window.CodeMirror);
    }
}(function ($, CodeMirror) {


    if ('function' !== typeof Array.prototype.reduce) {
        /**
         * Array.prototype.reduce fallback
         *
         * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/Reduce
         */
        Array.prototype.reduce = function (callback, optInitialValue) {
            var idx, value, length = this.length >>> 0, isValueSet = false;
            if (1 < arguments.length) {
                value = optInitialValue;
                isValueSet = true;
            }
            for (idx = 0; length > idx; ++idx) {
                if (this.hasOwnProperty(idx)) {
                    if (isValueSet) {
                        value = callback(value, this[idx], idx, this);
                    } else {
                        value = this[idx];
                        isValueSet = true;
                    }
                }
            }
            if (!isValueSet) {
                throw new TypeError('Reduce of empty array with no initial value');
            }
            return value;
        };
    }

    /**
     * Object which check platform and agent
     */
    var agent = {
        bMac: navigator.appVersion.indexOf('Mac') > -1,
        bMSIE: navigator.userAgent.indexOf('MSIE') > -1,
        bFF: navigator.userAgent.indexOf('Firefox') > -1,
        jqueryVersion: parseFloat($.fn.jquery),
        bCodeMirror: !!CodeMirror
    };

    /**
     * func utils (for high-order func's arg)
     */
    var func = (function () {
        var eq = function (elA) {
            return function (elB) {
                return elA === elB;
            };
        };

        var eq2 = function (elA, elB) {
            return elA === elB;
        };

        var ok = function () {
            return true;
        };

        var fail = function () {
            return false;
        };

        var not = function (f) {
            return function () {
                return !f.apply(f, arguments);
            };
        };

        var self = function (a) {
            return a;
        };

        return {
            eq: eq,
            eq2: eq2,
            ok: ok,
            fail: fail,
            not: not,
            self: self
        };
    })();

    /**
     * list utils
     */
    var list = (function () {
        /**
         * returns the first element of an array.
         * @param {Array} array
         */
        var head = function (array) {
            return array[0];
        };

        /**
         * returns the last element of an array.
         * @param {Array} array
         */
        var last = function (array) {
            return array[array.length - 1];
        };

        /**
         * returns everything but the last entry of the array.
         * @param {Array} array
         */
        var initial = function (array) {
            return array.slice(0, array.length - 1);
        };

        /**
         * returns the rest of the elements in an array.
         * @param {Array} array
         */
        var tail = function (array) {
            return array.slice(1);
        };

        /**
         * returns next item.
         * @param {Array} array
         */
        var next = function (array, item) {
            var idx = array.indexOf(item);
            if (idx === -1) {
                return null;
            }

            return array[idx + 1];
        };

        /**
         * returns prev item.
         * @param {Array} array
         */
        var prev = function (array, item) {
            var idx = array.indexOf(item);
            if (idx === -1) {
                return null;
            }

            return array[idx - 1];
        };

        /**
         * get sum from a list
         * @param {Array} array - array
         * @param {Function} fn - iterator
         */
        var sum = function (array, fn) {
            fn = fn || func.self;
            return array.reduce(function (memo, v) {
                return memo + fn(v);
            }, 0);
        };

        /**
         * returns a copy of the collection with array type.
         * @param {Collection} collection - collection eg) node.childNodes, ...
         */
        var from = function (collection) {
            var result = [], idx = -1, length = collection.length;
            while (++idx < length) {
                result[idx] = collection[idx];
            }
            return result;
        };

        /**
         * cluster elements by predicate function.
         * @param {Array} array - array
         * @param {Function} fn - predicate function for cluster rule
         * @param {Array[]}
         */
        var clusterBy = function (array, fn) {
            if (array.length === 0) {
                return [];
            }
            var aTail = tail(array);
            return aTail.reduce(function (memo, v) {
                var aLast = last(memo);
                if (fn(last(aLast), v)) {
                    aLast[aLast.length] = v;
                } else {
                    memo[memo.length] = [v];
                }
                return memo;
            }, [[head(array)]]);
        };

        /**
         * returns a copy of the array with all falsy values removed
         * @param {Array} array - array
         * @param {Function} fn - predicate function for cluster rule
         */
        var compact = function (array) {
            var aResult = [];
            for (var idx = 0, sz = array.length; idx < sz; idx++) {
                if (array[idx]) {
                    aResult.push(array[idx]);
                }
            }
            return aResult;
        };

        return {
            head: head, last: last, initial: initial, tail: tail,
            prev: prev, next: next, sum: sum, from: from,
            compact: compact, clusterBy: clusterBy
        };
    })();

    /**
     * Dom functions
     */
    var dom = (function () {
        /**
         * returns whether node is `note-editable` or not.
         *
         * @param {Element} node
         * @return {Boolean}
         */
        var isEditable = function (node) {
            return node && $(node).hasClass('note-editable');
        };

        var isControlSizing = function (node) {
            return node && $(node).hasClass('note-control-sizing');
        };

        /**
         * build layoutInfo from $editor(.note-editor)
         *
         * @param {jQuery} $editor
         * @return {Object}
         */
        var buildLayoutInfo = function ($editor) {
            var makeFinder = function (sClassName) {
                return function () {
                    return $editor.find(sClassName);
                };
            };
            return {
                editor: function () {
                    return $editor;
                },
                dropzone: makeFinder('.note-dropzone'),
                toolbar: makeFinder('.note-toolbar'),
                editable: makeFinder('.note-editable'),
                codable: makeFinder('.note-codable'),
                statusbar: makeFinder('.note-statusbar'),
                popover: makeFinder('.note-popover'),
                handle: makeFinder('.note-handle'),
                dialog: makeFinder('.note-dialog')
            };
        };

        /**
         * returns predicate which judge whether nodeName is same
         * @param {String} sNodeName
         */
        var makePredByNodeName = function (sNodeName) {
            // nodeName is always uppercase.
            return function (node) {
                return node && node.nodeName === sNodeName;
            };
        };

        var isPara = function (node) {
            // Chrome(v31.0), FF(v25.0.1) use DIV for paragraph
            return node && /^DIV|^P|^LI|^H[1-7]/.test(node.nodeName);
        };

        var isList = function (node) {
            return node && /^UL|^OL/.test(node.nodeName);
        };

        var isCell = function (node) {
            return node && /^TD|^TH/.test(node.nodeName);
        };

        /**
         * find nearest ancestor predicate hit
         *
         * @param {Element} node
         * @param {Function} pred - predicate function
         */
        var ancestor = function (node, pred) {
            while (node) {
                if (pred(node)) {
                    return node;
                }
                if (isEditable(node)) {
                    break;
                }

                node = node.parentNode;
            }
            return null;
        };

        /**
         * returns new array of ancestor nodes (until predicate hit).
         *
         * @param {Element} node
         * @param {Function} [optional] pred - predicate function
         */
        var listAncestor = function (node, pred) {
            pred = pred || func.fail;

            var aAncestor = [];
            ancestor(node, function (el) {
                aAncestor.push(el);
                return pred(el);
            });
            return aAncestor;
        };

        /**
         * returns common ancestor node between two nodes.
         *
         * @param {Element} nodeA
         * @param {Element} nodeB
         */
        var commonAncestor = function (nodeA, nodeB) {
            var aAncestor = listAncestor(nodeA);
            for (var n = nodeB; n; n = n.parentNode) {
                if ($.inArray(n, aAncestor) > -1) {
                    return n;
                }
            }
            return null; // difference document area
        };

        /**
         * listing all Nodes between two nodes.
         * FIXME: nodeA and nodeB must be sorted, use comparePoints later.
         *
         * @param {Element} nodeA
         * @param {Element} nodeB
         */
        var listBetween = function (nodeA, nodeB) {
            var aNode = [];

            var bStart = false, bEnd = false;

            // DFS(depth first search) with commonAcestor.
            (function fnWalk(node) {
                if (!node) {
                    return;
                } // traverse fisnish
                if (node === nodeA) {
                    bStart = true;
                } // start point
                if (bStart && !bEnd) {
                    aNode.push(node);
                } // between
                if (node === nodeB) {
                    bEnd = true;
                    return;
                } // end point

                for (var idx = 0, sz = node.childNodes.length; idx < sz; idx++) {
                    fnWalk(node.childNodes[idx]);
                }
            })(commonAncestor(nodeA, nodeB));

            return aNode;
        };

        /**
         * listing all previous siblings (until predicate hit).
         * @param {Element} node
         * @param {Function} [optional] pred - predicate function
         */
        var listPrev = function (node, pred) {
            pred = pred || func.fail;

            var aNext = [];
            while (node) {
                aNext.push(node);
                if (pred(node)) {
                    break;
                }
                node = node.previousSibling;
            }
            return aNext;
        };

        /**
         * listing next siblings (until predicate hit).
         *
         * @param {Element} node
         * @param {Function} [pred] - predicate function
         */
        var listNext = function (node, pred) {
            pred = pred || func.fail;

            var aNext = [];
            while (node) {
                aNext.push(node);
                if (pred(node)) {
                    break;
                }
                node = node.nextSibling;
            }
            return aNext;
        };

        /**
         * listing descendant nodes
         *
         * @param {Element} node
         * @param {Function} [pred] - predicate function
         */
        var listDescendant = function (node, pred) {
            var aDescendant = [];
            pred = pred || func.ok;

            // start DFS(depth first search) with node
            (function fnWalk(current) {
                if (node !== current && pred(current)) {
                    aDescendant.push(current);
                }
                for (var idx = 0, sz = current.childNodes.length; idx < sz; idx++) {
                    fnWalk(current.childNodes[idx]);
                }
            })(node);

            return aDescendant;
        };

        /**
         * insert node after preceding
         *
         * @param {Element} node
         * @param {Element} preceding - predicate function
         */
        var insertAfter = function (node, preceding) {
            var next = preceding.nextSibling, parent = preceding.parentNode;
            if (next) {
                parent.insertBefore(node, next);
            } else {
                parent.appendChild(node);
            }
            return node;
        };

        /**
         * append elements.
         *
         * @param {Element} node
         * @param {Collection} aChild
         */
        var appends = function (node, aChild) {
            $.each(aChild, function (idx, child) {
                node.appendChild(child);
            });
            return node;
        };

        var isText = makePredByNodeName('#text');

        /**
         * returns #text's text size or element's childNodes size
         *
         * @param {Element} node
         */
        var length = function (node) {
            if (isText(node)) {
                return node.nodeValue.length;
            }
            return node.childNodes.length;
        };

        /**
         * returns offset from parent.
         *
         * @param {Element} node
         */
        var position = function (node) {
            var offset = 0;
            while ((node = node.previousSibling)) {
                offset += 1;
            }
            return offset;
        };

        /**
         * return offsetPath(array of offset) from ancestor
         *
         * @param {Element} ancestor - ancestor node
         * @param {Element} node
         */
        var makeOffsetPath = function (ancestor, node) {
            var aAncestor = list.initial(listAncestor(node, func.eq(ancestor)));
            return $.map(aAncestor, position).reverse();
        };

        /**
         * return element from offsetPath(array of offset)
         *
         * @param {Element} ancestor - ancestor node
         * @param {array} aOffset - offsetPath
         */
        var fromOffsetPath = function (ancestor, aOffset) {
            var current = ancestor;
            for (var i = 0, sz = aOffset.length; i < sz; i++) {
                current = current.childNodes[aOffset[i]];
            }
            return current;
        };

        /**
         * split element or #text
         *
         * @param {Element} node
         * @param {Number} offset
         */
        var splitData = function (node, offset) {
            if (offset === 0) {
                return node;
            }
            if (offset >= length(node)) {
                return node.nextSibling;
            }

            // splitText
            if (isText(node)) {
                return node.splitText(offset);
            }

            // splitElement
            var child = node.childNodes[offset];
            node = insertAfter(node.cloneNode(false), node);
            return appends(node, listNext(child));
        };

        /**
         * split dom tree by boundaryPoint(pivot and offset)
         *
         * @param {Element} root
         * @param {Element} pivot - this will be boundaryPoint's node
         * @param {Number} offset - this will be boundaryPoint's offset
         */
        var split = function (root, pivot, offset) {
            var aAncestor = listAncestor(pivot, func.eq(root));
            if (aAncestor.length === 1) {
                return splitData(pivot, offset);
            }
            return aAncestor.reduce(function (node, parent) {
                var clone = parent.cloneNode(false);
                insertAfter(clone, parent);
                if (node === pivot) {
                    node = splitData(node, offset);
                }
                appends(clone, listNext(node));
                return clone;
            });
        };

        /**
         * remove node, (bRemoveChild: remove child or not)
         * @param {Element} node
         * @param {Boolean} bRemoveChild
         */
        var remove = function (node, bRemoveChild) {
            if (!node || !node.parentNode) {
                return;
            }
            if (node.removeNode) {
                return node.removeNode(bRemoveChild);
            }

            var elParent = node.parentNode;
            if (!bRemoveChild) {
                var aNode = [];
                var i, sz;
                for (i = 0, sz = node.childNodes.length; i < sz; i++) {
                    aNode.push(node.childNodes[i]);
                }

                for (i = 0, sz = aNode.length; i < sz; i++) {
                    elParent.insertBefore(aNode[i], node);
                }
            }

            elParent.removeChild(node);
        };

        var html = function ($node) {
            return dom.isTextarea($node[0]) ? $node.val() : $node.html();
        };

        return {
            blank: agent.bMSIE ? '&nbsp;' : '<br/>',
            emptyPara: '<p><br/></p>',
            isEditable: isEditable,
            isControlSizing: isControlSizing,
            buildLayoutInfo: buildLayoutInfo,
            isText: isText,
            isPara: isPara,
            isList: isList,
            isTable: makePredByNodeName('TABLE'),
            isCell: isCell,
            isAnchor: makePredByNodeName('A'),
            isDiv: makePredByNodeName('DIV'),
            isLi: makePredByNodeName('LI'),
            isSpan: makePredByNodeName('SPAN'),
            isB: makePredByNodeName('B'),
            isU: makePredByNodeName('U'),
            isS: makePredByNodeName('S'),
            isI: makePredByNodeName('I'),
            isImg: makePredByNodeName('IMG'),
            isTextarea: makePredByNodeName('TEXTAREA'),
            ancestor: ancestor,
            listAncestor: listAncestor,
            listNext: listNext,
            listPrev: listPrev,
            listDescendant: listDescendant,
            commonAncestor: commonAncestor,
            listBetween: listBetween,
            insertAfter: insertAfter,
            position: position,
            makeOffsetPath: makeOffsetPath,
            fromOffsetPath: fromOffsetPath,
            split: split,
            remove: remove,
            html: html
        };
    })();

    var settings = {
        // version
        version: '0.5.1',

        /**
         * options for init
         */
        options: {
            width: null,                  // set editor width
            height: null,                 // set editable height, ex) 300

            focus: false,                 // set focus after initilize summernote

            tabsize: null,                // size of tab ex) 2 or 4
            styleWithSpan: true,          // style with span (Chrome and FF)

            disableLinkTarget: false,     // hide link Target Checkbox
            disableDragAndDrop: false,    // disable drag and drop event

            codemirror: null,             // codemirror options

            // language
            lang: 'en-US',                // language 'en-US', 'ko-KR', ...
            direction: null,              // text direction, ex) 'rtl'

            // default toolbar
            toolbar: [
                ['style', ['style']],
                ['font', ['bold', 'italic', 'underline', 'clear']],
                ['fontname', ['fontname']],
                // ['fontsize', ['fontsize']], Still buggy
                ['color', ['color']],
                ['para', ['ul', 'ol', 'paragraph']],
                ['height', ['height']],
                ['table', ['table']],
                ['insert', ['link', 'picture', 'video']],
                ['view', ['fullscreen', 'codeview']],
                ['help', ['help']]
            ],

            // callbacks
            oninit: null,             // initialize
            onfocus: null,            // editable has focus
            onblur: null,             // editable out of focus
            onenter: null,            // enter key pressed
            onkeyup: null,            // keyup
            onkeydown: null,          // keydown
            onImageUpload: null,      // imageUploadHandler
            onImageUploadError: null, // imageUploadErrorHandler
            onToolbarClick: null,

            keyMap: {
                pc: {
                    'CTRL+Z': 'undo',
                    'CTRL+Y': 'redo',
                    'TAB': 'tab',
                    'SHIFT+TAB': 'untab',
                    'CTRL+B': 'bold',
                    'CTRL+I': 'italic',
                    'CTRL+U': 'underline',
                    'CTRL+SHIFT+S': 'strikethrough',
                    'CTRL+BACKSLASH': 'removeFormat',
                    'CTRL+SHIFT+L': 'justifyLeft',
                    'CTRL+SHIFT+E': 'justifyCenter',
                    'CTRL+SHIFT+R': 'justifyRight',
                    'CTRL+SHIFT+J': 'justifyFull',
                    'CTRL+SHIFT+NUM7': 'insertUnorderedList',
                    'CTRL+SHIFT+NUM8': 'insertOrderedList',
                    'CTRL+LEFTBRACKET': 'outdent',
                    'CTRL+RIGHTBRACKET': 'indent',
                    'CTRL+NUM0': 'formatPara',
                    'CTRL+NUM1': 'formatH1',
                    'CTRL+NUM2': 'formatH2',
                    'CTRL+NUM3': 'formatH3',
                    'CTRL+NUM4': 'formatH4',
                    'CTRL+NUM5': 'formatH5',
                    'CTRL+NUM6': 'formatH6',
                    'CTRL+ENTER': 'insertHorizontalRule'
                },

                mac: {
                    'CMD+Z': 'undo',
                    'CMD+SHIFT+Z': 'redo',
                    'TAB': 'tab',
                    'SHIFT+TAB': 'untab',
                    'CMD+B': 'bold',
                    'CMD+I': 'italic',
                    'CMD+U': 'underline',
                    'CMD+SHIFT+S': 'strikethrough',
                    'CMD+BACKSLASH': 'removeFormat',
                    'CMD+SHIFT+L': 'justifyLeft',
                    'CMD+SHIFT+E': 'justifyCenter',
                    'CMD+SHIFT+R': 'justifyRight',
                    'CMD+SHIFT+J': 'justifyFull',
                    'CMD+SHIFT+NUM7': 'insertUnorderedList',
                    'CMD+SHIFT+NUM8': 'insertOrderedList',
                    'CMD+LEFTBRACKET': 'outdent',
                    'CMD+RIGHTBRACKET': 'indent',
                    'CMD+NUM0': 'formatPara',
                    'CMD+NUM1': 'formatH1',
                    'CMD+NUM2': 'formatH2',
                    'CMD+NUM3': 'formatH3',
                    'CMD+NUM4': 'formatH4',
                    'CMD+NUM5': 'formatH5',
                    'CMD+NUM6': 'formatH6',
                    'CMD+ENTER': 'insertHorizontalRule'
                }
            }
        },

        // default language: en-US
        lang: {
            'en-US': {
                font: {
                    bold: '加粗',
                    italic: '斜体',
                    underline: '下划线',
                    strike: 'Strike',
                    clear: '清除字体样式',
                    height: '行高',
                    name: '字体',
                    size: '字体大小'
                },
                image: {
                    image: '图片',
                    insert: '插入图片',
                    resizeFull: 'Resize Full',
                    resizeHalf: 'Resize Half',
                    resizeQuarter: 'Resize Quarter',
                    floatLeft: '左浮',
                    floatRight: '右浮',
                    floatNone: 'Float None',
                    dragImageHere: 'Drag an image here',
                    selectFromFiles: '选择图片',
                    url: '图片URL',
                    remove: '删除图片'
                },
                link: {
                    link: '链接',
                    insert: '插入链接',
                    unlink: '取消链接',
                    edit: '编辑',
                    textToDisplay: '显示文本',
                    url: 'To what URL should this link go?',
                    openInNewWindow: '在新窗口中打开'
                },
                video: {
                    video: '录像',
                    videoLink: '录像链接',
                    insert: '插入录像',
                    url: '录像URL?',
                    providers: '(YouTube, Vimeo, Vine, Instagram, or DailyMotion)'
                },
                table: {
                    table: '表格'
                },
                hr: {
                    insert: '插入水平线'
                },
                style: {
                    style: '样式',
                    normal: '常规',
                    blockquote: '引用',
                    pre: '代码',
                    h1: 'Header 1',
                    h2: 'Header 2',
                    h3: 'Header 3',
                    h4: 'Header 4',
                    h5: 'Header 5',
                    h6: 'Header 6'
                },
                lists: {
                    unordered: '无序列表',
                    ordered: '有序列表'
                },
                options: {
                    help: '帮助',
                    fullscreen: '全屏',
                    codeview: '代码视图'
                },
                paragraph: {
                    paragraph: '段落',
                    outdent: 'Outdent',
                    indent: '缩进',
                    left: '左对齐',
                    center: '居中',
                    right: '右对齐',
                    justify: 'Justify full'
                },
                color: {
                    recent: '颜色',
                    more: '更多颜色',
                    background: '背景颜色',
                    foreground: '字体颜色',
                    transparent: '透明',
                    setTransparent: '设置颜色',
                    reset: '重置',
                    resetToDefault: 'Reset to default'
                },
                shortcut: {
                    shortcuts: 'Keyboard shortcuts',
                    close: 'Close',
                    textFormatting: 'Text formatting',
                    action: 'Action',
                    paragraphFormatting: '段落格式',
                    documentStyle: '文档样式'
                },
                history: {
                    undo: '撤消',
                    redo: '重做'
                }
            }
        }
    };

    /**
     * Async functions which returns `Promise`
     */
    var async = (function () {
        /**
         * read contents of file as representing URL
         *
         * @param {File} file
         * @return {Promise} - then: sDataUrl
         */
        var readFileAsDataURL = function (file) {
            return $.Deferred(function (deferred) {
                $.extend(new FileReader(), {
                    onload: function (e) {
                        var sDataURL = e.target.result;
                        deferred.resolve(sDataURL);
                    },
                    onerror: function () {
                        deferred.reject(this);
                    }
                }).readAsDataURL(file);
            }).promise();
        };

        /**
         * create `<image>` from url string
         *
         * @param {String} sUrl
         * @return {Promise} - then: $image
         */
        var createImage = function (sUrl) {
            return $.Deferred(function (deferred) {
                $('<img style="height:300px">').one('load', function () {
                    deferred.resolve($(this));
                }).one('error abort', function () {
                    deferred.reject($(this));
                }).css({
                    display: 'none'
                }).appendTo(document.body).attr('src', sUrl);
            }).promise();
        };

        return {
            readFileAsDataURL: readFileAsDataURL,
            createImage: createImage
        };
    })();

    /**
     * Object for keycodes.
     */
    var key = {
        isEdit: function (keyCode) {
            return [8, 9, 13, 32].indexOf(keyCode) !== -1;
        },
        nameFromCode: {
            '8': 'BACKSPACE',
            '9': 'TAB',
            '13': 'ENTER',
            '32': 'SPACE',

            // Number: 0-9
            '48': 'NUM0',
            '49': 'NUM1',
            '50': 'NUM2',
            '51': 'NUM3',
            '52': 'NUM4',
            '53': 'NUM5',
            '54': 'NUM6',
            '55': 'NUM7',
            '56': 'NUM8',

            // Alphabet: a-z
            '66': 'B',
            '69': 'E',
            '73': 'I',
            '74': 'J',
            '75': 'K',
            '76': 'L',
            '82': 'R',
            '83': 'S',
            '85': 'U',
            '89': 'Y',
            '90': 'Z',

            '191': 'SLASH',
            '219': 'LEFTBRACKET',
            '220': 'BACKSLASH',
            '221': 'RIGHTBRACKET'
        }
    };

    /**
     * Style
     * @class
     */
    var Style = function () {
        /**
         * passing an array of style properties to .css()
         * will result in an object of property-value pairs.
         * (compability with version < 1.9)
         *
         * @param  {jQuery} $obj
         * @param  {Array} propertyNames - An array of one or more CSS properties.
         * @returns {Object}
         */
        var jQueryCSS = function ($obj, propertyNames) {
            if (agent.jqueryVersion < 1.9) {
                var result = {};
                $.each(propertyNames, function (idx, propertyName) {
                    result[propertyName] = $obj.css(propertyName);
                });
                return result;
            }
            return $obj.css.call($obj, propertyNames);
        };

        /**
         * paragraph level style
         *
         * @param {WrappedRange} rng
         * @param {Object} oStyle
         */
        this.stylePara = function (rng, oStyle) {
            $.each(rng.nodes(dom.isPara), function (idx, elPara) {
                $(elPara).css(oStyle);
            });
        };

        /**
         * get current style on cursor
         *
         * @param {WrappedRange} rng
         * @param {Element} elTarget - target element on event
         * @return {Object} - object contains style properties.
         */
        this.current = function (rng, elTarget) {
            var $cont = $(dom.isText(rng.sc) ? rng.sc.parentNode : rng.sc);
            var properties = ['font-family', 'font-size', 'text-align', 'list-style-type', 'line-height'];
            var oStyle = jQueryCSS($cont, properties) || {};

            oStyle['font-size'] = parseInt(oStyle['font-size']);

            // document.queryCommandState for toggle state
            oStyle['font-bold'] = document.queryCommandState('bold') ? 'bold' : 'normal';
            oStyle['font-italic'] = document.queryCommandState('italic') ? 'italic' : 'normal';
            oStyle['font-underline'] = document.queryCommandState('underline') ? 'underline' : 'normal';

            // list-style-type to list-style(unordered, ordered)
            if (!rng.isOnList()) {
                oStyle['list-style'] = 'none';
            } else {
                var aOrderedType = ['circle', 'disc', 'disc-leading-zero', 'square'];
                var bUnordered = $.inArray(oStyle['list-style-type'], aOrderedType) > -1;
                oStyle['list-style'] = bUnordered ? 'unordered' : 'ordered';
            }

            var elPara = dom.ancestor(rng.sc, dom.isPara);
            if (elPara && elPara.style['line-height']) {
                oStyle['line-height'] = elPara.style.lineHeight;
            } else {
                var lineHeight = parseInt(oStyle['line-height']) / parseInt(oStyle['font-size']);
                oStyle['line-height'] = lineHeight.toFixed(1);
            }

            oStyle.image = dom.isImg(elTarget) && elTarget;
            oStyle.anchor = rng.isOnAnchor() && dom.ancestor(rng.sc, dom.isAnchor);
            oStyle.aAncestor = dom.listAncestor(rng.sc, dom.isEditable);

            return oStyle;
        };
    };

    /**
     * range module
     */
    var range = (function () {
        var bW3CRangeSupport = !!document.createRange;

        /**
         * return boundaryPoint from TextRange, inspired by Andy Na's HuskyRange.js
         * @param {TextRange} textRange
         * @param {Boolean} bStart
         * @return {BoundaryPoint}
         */
        var textRange2bp = function (textRange, bStart) {
            var elCont = textRange.parentElement(), nOffset;

            var tester = document.body.createTextRange(), elPrevCont;
            var aChild = list.from(elCont.childNodes);
            for (nOffset = 0; nOffset < aChild.length; nOffset++) {
                if (dom.isText(aChild[nOffset])) {
                    continue;
                }
                tester.moveToElementText(aChild[nOffset]);
                if (tester.compareEndPoints('StartToStart', textRange) >= 0) {
                    break;
                }
                elPrevCont = aChild[nOffset];
            }

            if (nOffset !== 0 && dom.isText(aChild[nOffset - 1])) {
                var textRangeStart = document.body.createTextRange(), elCurText = null;
                textRangeStart.moveToElementText(elPrevCont || elCont);
                textRangeStart.collapse(!elPrevCont);
                elCurText = elPrevCont ? elPrevCont.nextSibling : elCont.firstChild;

                var pointTester = textRange.duplicate();
                pointTester.setEndPoint('StartToStart', textRangeStart);
                var nTextCount = pointTester.text.replace(/[\r\n]/g, '').length;

                while (nTextCount > elCurText.nodeValue.length && elCurText.nextSibling) {
                    nTextCount -= elCurText.nodeValue.length;
                    elCurText = elCurText.nextSibling;
                }

                /* jshint ignore:start */
                var sDummy = elCurText.nodeValue; //enforce IE to re-reference elCurText, hack
                /* jshint ignore:end */

                if (bStart && elCurText.nextSibling && dom.isText(elCurText.nextSibling) &&
                    nTextCount === elCurText.nodeValue.length) {
                    nTextCount -= elCurText.nodeValue.length;
                    elCurText = elCurText.nextSibling;
                }

                elCont = elCurText;
                nOffset = nTextCount;
            }

            return {cont: elCont, offset: nOffset};
        };

        /**
         * return TextRange from boundary point (inspired by google closure-library)
         * @param {BoundaryPoint} bp
         * @return {TextRange}
         */
        var bp2textRange = function (bp) {
            var textRangeInfo = function (elCont, nOffset) {
                var elNode, bCollapseToStart;

                if (dom.isText(elCont)) {
                    var aPrevText = dom.listPrev(elCont, func.not(dom.isText));
                    var elPrevCont = list.last(aPrevText).previousSibling;
                    elNode = elPrevCont || elCont.parentNode;
                    nOffset += list.sum(list.tail(aPrevText), dom.length);
                    bCollapseToStart = !elPrevCont;
                } else {
                    elNode = elCont.childNodes[nOffset] || elCont;
                    if (dom.isText(elNode)) {
                        return textRangeInfo(elNode, nOffset);
                    }

                    nOffset = 0;
                    bCollapseToStart = false;
                }

                return {cont: elNode, collapseToStart: bCollapseToStart, offset: nOffset};
            };

            var textRange = document.body.createTextRange();
            var info = textRangeInfo(bp.cont, bp.offset);

            textRange.moveToElementText(info.cont);
            textRange.collapse(info.collapseToStart);
            textRange.moveStart('character', info.offset);
            return textRange;
        };

        /**
         * Wrapped Range
         *
         * @param {Element} sc - start container
         * @param {Number} so - start offset
         * @param {Element} ec - end container
         * @param {Number} eo - end offset
         */
        var WrappedRange = function (sc, so, ec, eo) {
            this.sc = sc;
            this.so = so;
            this.ec = ec;
            this.eo = eo;

            // nativeRange: get nativeRange from sc, so, ec, eo
            var nativeRange = function () {
                if (bW3CRangeSupport) {
                    var w3cRange = document.createRange();
                    w3cRange.setStart(sc, so);
                    w3cRange.setEnd(ec, eo);
                    return w3cRange;
                } else {
                    var textRange = bp2textRange({cont: sc, offset: so});
                    textRange.setEndPoint('EndToEnd', bp2textRange({cont: ec, offset: eo}));
                    return textRange;
                }
            };

            /**
             * select update visible range
             */
            this.select = function () {
                var nativeRng = nativeRange();
                if (bW3CRangeSupport) {
                    var selection = document.getSelection();
                    if (selection.rangeCount > 0) {
                        selection.removeAllRanges();
                    }
                    selection.addRange(nativeRng);
                } else {
                    nativeRng.select();
                }
            };

            /**
             * returns matched nodes on range
             *
             * @param {Function} pred - predicate function
             * @return {Element[]}
             */
            this.nodes = function (pred) {
                var aNode = dom.listBetween(sc, ec);
                var aMatched = list.compact($.map(aNode, function (node) {
                    return dom.ancestor(node, pred);
                }));
                return $.map(list.clusterBy(aMatched, func.eq2), list.head);
            };

            /**
             * returns commonAncestor of range
             * @return {Element} - commonAncestor
             */
            this.commonAncestor = function () {
                return dom.commonAncestor(sc, ec);
            };

            /**
             * makeIsOn: return isOn(pred) function
             */
            var makeIsOn = function (pred) {
                return function () {
                    var elAncestor = dom.ancestor(sc, pred);
                    return !!elAncestor && (elAncestor === dom.ancestor(ec, pred));
                };
            };

            // isOnEditable: judge whether range is on editable or not
            this.isOnEditable = makeIsOn(dom.isEditable);
            // isOnList: judge whether range is on list node or not
            this.isOnList = makeIsOn(dom.isList);
            // isOnAnchor: judge whether range is on anchor node or not
            this.isOnAnchor = makeIsOn(dom.isAnchor);
            // isOnAnchor: judge whether range is on cell node or not
            this.isOnCell = makeIsOn(dom.isCell);
            // isCollapsed: judge whether range was collapsed
            this.isCollapsed = function () {
                return sc === ec && so === eo;
            };

            /**
             * insert node at current cursor
             * @param {Element} node
             */
            this.insertNode = function (node) {
                var nativeRng = nativeRange();
                if (bW3CRangeSupport) {
                    nativeRng.insertNode(node);
                } else {
                    nativeRng.pasteHTML(node.outerHTML); // NOTE: missing node reference.
                }
            };

            this.toString = function () {
                var nativeRng = nativeRange();
                return bW3CRangeSupport ? nativeRng.toString() : nativeRng.text;
            };

            // bookmark: offsetPath bookmark
            this.bookmark = function (elEditable) {
                return {
                    s: {path: dom.makeOffsetPath(elEditable, sc), offset: so},
                    e: {path: dom.makeOffsetPath(elEditable, ec), offset: eo}
                };
            };
        };

        return {
            /**
             * create Range Object From arguments or Browser Selection
             *
             * @param {Element} sc - start container
             * @param {Number} so - start offset
             * @param {Element} ec - end container
             * @param {Number} eo - end offset
             */
            create: function (sc, so, ec, eo) {
                if (arguments.length === 0) { // from Browser Selection
                    if (bW3CRangeSupport) { // webkit, firefox
                        var selection = document.getSelection();
                        if (selection.rangeCount === 0) {
                            return null;
                        }

                        var nativeRng = selection.getRangeAt(0);
                        sc = nativeRng.startContainer;
                        so = nativeRng.startOffset;
                        ec = nativeRng.endContainer;
                        eo = nativeRng.endOffset;
                    } else { // IE8: TextRange
                        var textRange = document.selection.createRange();
                        var textRangeEnd = textRange.duplicate();
                        textRangeEnd.collapse(false);
                        var textRangeStart = textRange;
                        textRangeStart.collapse(true);

                        var bpStart = textRange2bp(textRangeStart, true),
                            bpEnd = textRange2bp(textRangeEnd, false);

                        sc = bpStart.cont;
                        so = bpStart.offset;
                        ec = bpEnd.cont;
                        eo = bpEnd.offset;
                    }
                } else if (arguments.length === 2) { //collapsed
                    ec = sc;
                    eo = so;
                }
                return new WrappedRange(sc, so, ec, eo);
            },

            /**
             * create WrappedRange from node
             *
             * @param {Element} node
             * @return {WrappedRange}
             */
            createFromNode: function (node) {
                return this.create(node, 0, node, 1);
            },

            /**
             * create WrappedRange from Bookmark
             *
             * @param {Element} elEditable
             * @param {Obkect} bookmark
             * @return {WrappedRange}
             */
            createFromBookmark: function (elEditable, bookmark) {
                var sc = dom.fromOffsetPath(elEditable, bookmark.s.path);
                var so = bookmark.s.offset;
                var ec = dom.fromOffsetPath(elEditable, bookmark.e.path);
                var eo = bookmark.e.offset;
                return new WrappedRange(sc, so, ec, eo);
            }
        };
    })();

    /**
     * Table
     * @class
     */
    var Table = function () {
        /**
         * handle tab key
         *
         * @param {WrappedRange} rng
         * @param {Boolean} bShift
         */
        this.tab = function (rng, bShift) {
            var elCell = dom.ancestor(rng.commonAncestor(), dom.isCell);
            var elTable = dom.ancestor(elCell, dom.isTable);
            var aCell = dom.listDescendant(elTable, dom.isCell);

            var elNext = list[bShift ? 'prev' : 'next'](aCell, elCell);
            if (elNext) {
                range.create(elNext, 0).select();
            }
        };

        /**
         * create empty table element
         *
         * @param {Number} nRow
         * @param {Number} nCol
         */
        this.createTable = function (nCol, nRow) {
            var aTD = [], sTD;
            for (var idxCol = 0; idxCol < nCol; idxCol++) {
                aTD.push('<td>' + dom.blank + '</td>');
            }
            sTD = aTD.join('');

            var aTR = [], sTR;
            for (var idxRow = 0; idxRow < nRow; idxRow++) {
                aTR.push('<tr>' + sTD + '</tr>');
            }
            sTR = aTR.join('');
            var sTable = '<table class="table table-bordered">' + sTR + '</table>';

            return $(sTable)[0];
        };
    };

    /**
     * Editor
     * @class
     */
    var Editor = function () {

        var style = new Style();
        var table = new Table();

        /**
         * save current range
         *
         * @param {jQuery} $editable
         */
        this.saveRange = function ($editable) {
            $editable.data('range', range.create());
        };

        /**
         * restore lately range
         *
         * @param {jQuery} $editable
         */
        this.restoreRange = function ($editable) {
            var rng = $editable.data('range');
            if (rng) {
                rng.select();
            }
        };

        /**
         * current style
         * @param {Element} elTarget
         */
        this.currentStyle = function (elTarget) {
            var rng = range.create();
            return rng.isOnEditable() && style.current(rng, elTarget);
        };

        /**
         * undo
         * @param {jQuery} $editable
         */
        this.undo = function ($editable) {
            $editable.data('NoteHistory').undo($editable);
        };

        /**
         * redo
         * @param {jQuery} $editable
         */
        this.redo = function ($editable) {
            $editable.data('NoteHistory').redo($editable);
        };

        /**
         * record Undo
         * @param {jQuery} $editable
         */
        var recordUndo = this.recordUndo = function ($editable) {
            $editable.data('NoteHistory').recordUndo($editable);
        };

        /* jshint ignore:start */
        // native commands(with execCommand), generate function for execCommand
        var aCmd = ['bold', 'italic', 'underline', 'strikethrough',
            'justifyLeft', 'justifyCenter', 'justifyRight', 'justifyFull',
            'insertOrderedList', 'insertUnorderedList',
            'indent', 'outdent', 'formatBlock', 'removeFormat',
            'backColor', 'foreColor', 'insertHorizontalRule', 'fontName'];

        for (var idx = 0, len = aCmd.length; idx < len; idx++) {
            this[aCmd[idx]] = (function (sCmd) {
                return function ($editable, sValue) {
                    recordUndo($editable);
                    document.execCommand(sCmd, false, sValue);
                };
            })(aCmd[idx]);
        }
        /* jshint ignore:end */

        /**
         * @param {jQuery} $editable
         * @param {WrappedRange} rng
         * @param {Number} nTabsize
         */
        var insertTab = function ($editable, rng, nTabsize) {
            recordUndo($editable);
            var sNbsp = new Array(nTabsize + 1).join('&nbsp;');
            rng.insertNode($('<span id="noteTab">' + sNbsp + '</span>')[0]);
            var $tab = $('#noteTab').removeAttr('id');
            rng = range.create($tab[0], 1);
            rng.select();
            dom.remove($tab[0]);
        };

        /**
         * handle tab key
         * @param {jQuery} $editable
         * @param {Number} nTabsize
         * @param {Boolean} bShift
         */
        this.tab = function ($editable, options) {
            var rng = range.create();
            if (rng.isCollapsed() && rng.isOnCell()) {
                table.tab(rng);
            } else {
                insertTab($editable, rng, options.tabsize);
            }
        };

        /**
         * handle shift+tab key
         */
        this.untab = function () {
            var rng = range.create();
            if (rng.isCollapsed() && rng.isOnCell()) {
                table.tab(rng, true);
            }
        };

        /**
         * insert image
         *
         * @param {jQuery} $editable
         * @param {String} sUrl
         */
        this.insertImage = function ($editable, sUrl) {
            async.createImage(sUrl).then(function ($image) {
                recordUndo($editable);
                $image.css({
                    display: '',
                    width: Math.min($editable.width(), $image.width())
                });
                range.create().insertNode($image[0]);
            }).fail(function () {
                var callbacks = $editable.data('callbacks');
                if (callbacks.onImageUploadError) {
                    callbacks.onImageUploadError();
                }
            });
        };

        /**
         * insert video
         * @param {jQuery} $editable
         * @param {String} sUrl
         */
        this.insertVideo = function ($editable, sUrl) {
            recordUndo($editable);

            // video url patterns(youtube, instagram, vimeo, dailymotion)
            var ytRegExp = /^.*(youtu.be\/|v\/|u\/\w\/|embed\/|watch\?v=|\&v=)([^#\&\?]*).*/;
            var ytMatch = sUrl.match(ytRegExp);

            var igRegExp = /\/\/instagram.com\/p\/(.[a-zA-Z0-9]*)/;
            var igMatch = sUrl.match(igRegExp);

            var vRegExp = /\/\/vine.co\/v\/(.[a-zA-Z0-9]*)/;
            var vMatch = sUrl.match(vRegExp);

            var vimRegExp = /\/\/(player.)?vimeo.com\/([a-z]*\/)*([0-9]{6,11})[?]?.*/;
            var vimMatch = sUrl.match(vimRegExp);

            var dmRegExp = /.+dailymotion.com\/(video|hub)\/([^_]+)[^#]*(#video=([^_&]+))?/;
            var dmMatch = sUrl.match(dmRegExp);

            var $video;
            if (ytMatch && ytMatch[2].length === 11) {
                var youtubeId = ytMatch[2];
                $video = $('<iframe>')
                    .attr('src', '../www.youtube.com/embed/' + youtubeId)
                    .attr('width', '640').attr('height', '360');
            } else if (igMatch && igMatch[0].length > 0) {
                $video = $('<iframe>')
                    .attr('src', igMatch[0] + 'embed/default.htm')
                    .attr('width', '612').attr('height', '710')
                    .attr('scrolling', 'no')
                    .attr('allowtransparency', 'true');
            } else if (vMatch && vMatch[0].length > 0) {
                $video = $('<iframe>')
                    .attr('src', vMatch[0] + '/embed/simple')
                    .attr('width', '600').attr('height', '600')
                    .attr('class', 'vine-embed');
            } else if (vimMatch && vimMatch[3].length > 0) {
                $video = $('<iframe webkitallowfullscreen mozallowfullscreen allowfullscreen>')
                    .attr('src', '../player.vimeo.com/video/' + vimMatch[3])
                    .attr('width', '640').attr('height', '360');
            } else if (dmMatch && dmMatch[2].length > 0) {
                $video = $('<iframe>')
                    .attr('src', '../www.dailymotion.com/embed/video/' + dmMatch[2])
                    .attr('width', '640').attr('height', '360');
            } else {
                // this is not a known video link. Now what, Cat? Now what?
            }

            if ($video) {
                $video.attr('frameborder', 0);
                range.create().insertNode($video[0]);
            }
        };

        /**
         * formatBlock
         *
         * @param {jQuery} $editable
         * @param {String} sTagName
         */
        this.formatBlock = function ($editable, sTagName) {
            recordUndo($editable);
            sTagName = agent.bMSIE ? '<' + sTagName + '>' : sTagName;
            document.execCommand('FormatBlock', false, sTagName);
        };

        this.formatPara = function ($editable) {
            this.formatBlock($editable, 'P');
        };

        /* jshint ignore:start */
        for (var idx = 1; idx <= 6; idx++) {
            this['formatH' + idx] = function (idx) {
                return function ($editable) {
                    this.formatBlock($editable, 'H' + idx);
                };
            }(idx);
        }
        ;
        /* jshint ignore:end */

        /**
         * fontsize
         * FIXME: Still buggy
         *
         * @param {jQuery} $editable
         * @param {String} sValue - px
         */
        this.fontSize = function ($editable, sValue) {
            recordUndo($editable);
            document.execCommand('fontSize', false, 3);
            if (agent.bFF) {
                // firefox: <font size="3"> to <span style='font-size={sValue}px;'>, buggy
                $editable.find('font[size=3]').removeAttr('size').css('font-size', sValue + 'px');
            } else {
                // chrome: <span style="font-size: medium"> to <span style='font-size={sValue}px;'>
                $editable.find('span').filter(function () {
                    return this.style.fontSize === 'medium';
                }).css('font-size', sValue + 'px');
            }
        };

        /**
         * lineHeight
         * @param {jQuery} $editable
         * @param {String} sValue
         */
        this.lineHeight = function ($editable, sValue) {
            recordUndo($editable);
            style.stylePara(range.create(), {lineHeight: sValue});
        };

        /**
         * unlink
         * @param {jQuery} $editable
         */
        this.unlink = function ($editable) {
            var rng = range.create();
            if (rng.isOnAnchor()) {
                recordUndo($editable);
                var elAnchor = dom.ancestor(rng.sc, dom.isAnchor);
                rng = range.createFromNode(elAnchor);
                rng.select();
                document.execCommand('unlink');
            }
        };

        /**
         * create link
         *
         * @param {jQuery} $editable
         * @param {String} sLinkUrl
         * @param {Boolean} bNewWindow
         */
        this.createLink = function ($editable, sLinkUrl, bNewWindow) {
            var rng = range.create();
            recordUndo($editable);

            // protocol
            var sLinkUrlWithProtocol = sLinkUrl;
            if (sLinkUrl.indexOf('@') !== -1 && sLinkUrl.indexOf(':') === -1) {
                sLinkUrlWithProtocol = 'mailto:' + sLinkUrl;
            } else if (sLinkUrl.indexOf('://') === -1) {
                sLinkUrlWithProtocol = 'http://' + sLinkUrl;
            }

            // createLink when range collapsed (IE, Firefox).
            if ((agent.bMSIE || agent.bFF) && rng.isCollapsed()) {
                rng.insertNode($('<A id="linkAnchor">' + sLinkUrl + '</A>')[0]);
                var $anchor = $('#linkAnchor').attr('href', sLinkUrlWithProtocol).removeAttr('id');
                rng = range.createFromNode($anchor[0]);
                rng.select();
            } else {
                document.execCommand('createlink', false, sLinkUrlWithProtocol);
                rng = range.create();
            }

            // target
            $.each(rng.nodes(dom.isAnchor), function (idx, elAnchor) {
                if (bNewWindow) {
                    $(elAnchor).attr('target', '_blank');
                } else {
                    $(elAnchor).removeAttr('target');
                }
            });
        };

        /**
         * get link info
         *
         * @return {Promise}
         */
        this.getLinkInfo = function () {
            var rng = range.create();
            var bNewWindow = true;
            var sUrl = '';

            // If range on anchor expand range on anchor(for edit link).
            if (rng.isOnAnchor()) {
                var elAnchor = dom.ancestor(rng.sc, dom.isAnchor);
                rng = range.createFromNode(elAnchor);
                bNewWindow = $(elAnchor).attr('target') === '_blank';
                sUrl = elAnchor.href;
            }

            return {
                text: rng.toString(),
                url: sUrl,
                newWindow: bNewWindow
            };
        };

        /**
         * get video info
         *
         * @return {Object}
         */
        this.getVideoInfo = function () {
            var rng = range.create();

            if (rng.isOnAnchor()) {
                var elAnchor = dom.ancestor(rng.sc, dom.isAnchor);
                rng = range.createFromNode(elAnchor);
            }

            return {
                text: rng.toString()
            };
        };

        this.color = function ($editable, sObjColor) {
            var oColor = JSON.parse(sObjColor);
            var foreColor = oColor.foreColor, backColor = oColor.backColor;

            recordUndo($editable);
            if (foreColor) {
                document.execCommand('foreColor', false, foreColor);
            }
            if (backColor) {
                document.execCommand('backColor', false, backColor);
            }
        };

        this.insertTable = function ($editable, sDim) {
            recordUndo($editable);
            var aDim = sDim.split('x');
            range.create().insertNode(table.createTable(aDim[0], aDim[1]));
        };

        /**
         * @param {jQuery} $editable
         * @param {String} sValue
         * @param {jQuery} $target
         */
        this.floatMe = function ($editable, sValue, $target) {
            recordUndo($editable);
            $target.css('float', sValue);
        };

        /**
         * resize overlay element
         * @param {jQuery} $editable
         * @param {String} sValue
         * @param {jQuery} $target - target element
         */
        this.resize = function ($editable, sValue, $target) {
            recordUndo($editable);

            $target.css({
                width: $editable.width() * sValue + 'px',
                height: ''
            });
        };

        /**
         * @param {Position} pos
         * @param {jQuery} $target - target element
         * @param {Boolean} [bKeepRatio] - keep ratio
         */
        this.resizeTo = function (pos, $target, bKeepRatio) {
            var szImage;
            if (bKeepRatio) {
                var newRatio = pos.y / pos.x;
                var ratio = $target.data('ratio');
                szImage = {
                    width: ratio > newRatio ? pos.x : pos.y / ratio,
                    height: ratio > newRatio ? pos.x * ratio : pos.y
                };
            } else {
                szImage = {
                    width: pos.x,
                    height: pos.y
                };
            }

            $target.css(szImage);
        };

        /**
         * remove media object
         *
         * @param {jQuery} $editable
         * @param {String} sValue - dummy argument (for keep interface)
         * @param {jQuery} $target - target element
         */
        this.removeMedia = function ($editable, sValue, $target) {
            recordUndo($editable);
            $target.detach();
        };
    };

    /**
     * History
     * @class
     */
    var History = function () {
        var aUndo = [], aRedo = [];

        var makeSnap = function ($editable) {
            var elEditable = $editable[0], rng = range.create();
            return {
                contents: $editable.html(),
                bookmark: rng.bookmark(elEditable),
                scrollTop: $editable.scrollTop()
            };
        };

        var applySnap = function ($editable, oSnap) {
            $editable.html(oSnap.contents).scrollTop(oSnap.scrollTop);
            range.createFromBookmark($editable[0], oSnap.bookmark).select();
        };

        this.undo = function ($editable) {
            var oSnap = makeSnap($editable);
            if (aUndo.length === 0) {
                return;
            }
            applySnap($editable, aUndo.pop());
            aRedo.push(oSnap);
        };

        this.redo = function ($editable) {
            var oSnap = makeSnap($editable);
            if (aRedo.length === 0) {
                return;
            }
            applySnap($editable, aRedo.pop());
            aUndo.push(oSnap);
        };

        this.recordUndo = function ($editable) {
            aRedo = [];
            aUndo.push(makeSnap($editable));
        };
    };

    /**
     * Toolbar
     */
    var Toolbar = function () {
        /**
         * update button status
         *
         * @param {jQuery} $toolbar
         * @param {Object} oStyle
         */
        this.update = function ($toolbar, oStyle) {

            /**
             * handle dropdown's check mark (for fontname, fontsize, lineHeight).
             * @param {jQuery} $btn
             * @param {Number} nValue
             */
            var checkDropdownMenu = function ($btn, nValue) {
                $btn.find('.dropdown-menu li a').each(function () {
                    // always compare string to avoid creating another func.
                    var bChecked = ($(this).data('value') + '') === (nValue + '');
                    this.className = bChecked ? 'checked' : '';
                });
            };

            /**
             * update button state(active or not).
             *
             * @param {String} sSelector
             * @param {Function} pred
             */
            var btnState = function (sSelector, pred) {
                var $btn = $toolbar.find(sSelector);
                $btn.toggleClass('active', pred());
            };

            // fontname
            var $fontname = $toolbar.find('.note-fontname');
            if ($fontname.length > 0) {
                var selectedFont = oStyle['font-family'];
                if (!!selectedFont) {
                    selectedFont = list.head(selectedFont.split(','));
                    selectedFont = selectedFont.replace(/\'/g, '');
                    $fontname.find('.note-current-fontname').text(selectedFont);
                    checkDropdownMenu($fontname, selectedFont);
                }
            }

            // fontsize
            var $fontsize = $toolbar.find('.note-fontsize');
            $fontsize.find('.note-current-fontsize').text(oStyle['font-size']);
            checkDropdownMenu($fontsize, parseFloat(oStyle['font-size']));

            // lineheight
            var $lineHeight = $toolbar.find('.note-height');
            checkDropdownMenu($lineHeight, parseFloat(oStyle['line-height']));

            btnState('button[data-event="bold"]', function () {
                return oStyle['font-bold'] === 'bold';
            });
            btnState('button[data-event="italic"]', function () {
                return oStyle['font-italic'] === 'italic';
            });
            btnState('button[data-event="underline"]', function () {
                return oStyle['font-underline'] === 'underline';
            });
            btnState('button[data-event="justifyLeft"]', function () {
                return oStyle['text-align'] === 'left' || oStyle['text-align'] === 'start';
            });
            btnState('button[data-event="justifyCenter"]', function () {
                return oStyle['text-align'] === 'center';
            });
            btnState('button[data-event="justifyRight"]', function () {
                return oStyle['text-align'] === 'right';
            });
            btnState('button[data-event="justifyFull"]', function () {
                return oStyle['text-align'] === 'justify';
            });
            btnState('button[data-event="insertUnorderedList"]', function () {
                return oStyle['list-style'] === 'unordered';
            });
            btnState('button[data-event="insertOrderedList"]', function () {
                return oStyle['list-style'] === 'ordered';
            });
        };

        /**
         * update recent color
         *
         * @param {Element} elBtn
         * @param {String} sEvent
         * @param {sValue} sValue
         */
        this.updateRecentColor = function (elBtn, sEvent, sValue) {
            var $color = $(elBtn).closest('.note-color');
            var $recentColor = $color.find('.note-recent-color');
            var oColor = JSON.parse($recentColor.attr('data-value'));
            oColor[sEvent] = sValue;
            $recentColor.attr('data-value', JSON.stringify(oColor));
            var sKey = sEvent === 'backColor' ? 'background-color' : 'color';
            $recentColor.find('i').css(sKey, sValue);
        };

        this.updateFullscreen = function ($toolbar, bFullscreen) {
            var $btn = $toolbar.find('button[data-event="fullscreen"]');
            $btn.toggleClass('active', bFullscreen);
        };

        this.updateCodeview = function ($toolbar, bCodeview) {
            var $btn = $toolbar.find('button[data-event="codeview"]');
            $btn.toggleClass('active', bCodeview);
        };

        /**
         * activate buttons exclude codeview
         * @param {jQuery} $toolbar
         */
        this.activate = function ($toolbar) {
            $toolbar.find('button').not('button[data-event="codeview"]').removeClass('disabled');
        };

        /**
         * deactivate buttons exclude codeview
         * @param {jQuery} $toolbar
         */
        this.deactivate = function ($toolbar) {
            $toolbar.find('button').not('button[data-event="codeview"]').addClass('disabled');
        };
    };

    /**
     * Popover (http://getbootstrap.com/javascript/#popovers)
     */
    var Popover = function () {
        /**
         * show popover
         * @param {jQuery} popover
         * @param {Element} elPlaceholder - placeholder for popover
         */
        var showPopover = function ($popover, elPlaceholder) {
            var $placeholder = $(elPlaceholder);
            var pos = $placeholder.position(), height = $placeholder.height();

            // display popover below placeholder.
            $popover.css({
                display: 'block',
                left: pos.left,
                top: pos.top + height
            });
        };

        /**
         * update current state
         * @param {jQuery} $popover - popover container
         * @param {Object} oStyle - style object
         */
        this.update = function ($popover, oStyle) {
            var $linkPopover = $popover.find('.note-link-popover');

            if (oStyle.anchor) {
                var $anchor = $linkPopover.find('a');
                $anchor.attr('href', oStyle.anchor.href).html(oStyle.anchor.href);
                showPopover($linkPopover, oStyle.anchor);
            } else {
                $linkPopover.hide();
            }

            var $imagePopover = $popover.find('.note-image-popover');
            if (oStyle.image) {
                showPopover($imagePopover, oStyle.image);
            } else {
                $imagePopover.hide();
            }
        };

        /**
         * hide all popovers
         * @param {jQuery} $popover - popover contaienr
         */
        this.hide = function ($popover) {
            $popover.children().hide();
        };
    };

    /**
     * Handle
     */
    var Handle = function () {
        /**
         * update handle
         * @param {jQuery} $handle
         * @param {Object} oStyle
         */
        this.update = function ($handle, oStyle) {
            var $selection = $handle.find('.note-control-selection');
            if (oStyle.image) {
                var $image = $(oStyle.image);
                var pos = $image.position();
                var szImage = {w: $image.width(), h: $image.height()};
                $selection.css({
                    display: 'block',
                    left: pos.left,
                    top: pos.top,
                    width: szImage.w,
                    height: szImage.h
                }).data('target', oStyle.image); // save current image element.
                var sSizing = szImage.w + 'x' + szImage.h;
                $selection.find('.note-control-selection-info').text(sSizing);
            } else {
                $selection.hide();
            }
        };

        this.hide = function ($handle) {
            $handle.children().hide();
        };
    };

    /**
     * Dialog
     *
     * @class
     */
    var Dialog = function () {

        /**
         * toggle button status
         *
         * @param {jQuery} $btn
         * @param {Boolean} bEnable
         */
        var toggleBtn = function ($btn, bEnable) {
            $btn.toggleClass('disabled', !bEnable);
            $btn.attr('disabled', !bEnable);
        };

        /**
         * show image dialog
         *
         * @param {jQuery} $editable
         * @param {jQuery} $dialog
         * @return {Promise}
         */
        this.showImageDialog = function ($editable, $dialog) {
            return $.Deferred(function (deferred) {
                var $imageDialog = $dialog.find('.note-image-dialog');

                var $imageInput = $dialog.find('.note-image-input'),
                    $imageUrl = $dialog.find('.note-image-url'),
                    $imageBtn = $dialog.find('.note-image-btn');

                $imageDialog.one('shown.bs.modal', function (event) {
                    event.stopPropagation();

                    // Cloning imageInput to clear element.
                    $imageInput.replaceWith($imageInput.clone()
                        .on('change', function () {
                            $(".note-image-btn").removeAttr("disabled").removeClass("disabled");
                            //$imageDialog.modal('hide');
                            //deferred.resolve(this.files);
                        })
                    );

                    $imageBtn.click(function (event) {
                        event.preventDefault();
                        $imageDialog.modal('hide');
                        //deferred.resolve($imageUrl.val());
                        $.ajaxFileUpload({
                            url: "/sys/file/upload?module=editor", //上传文件的服务端
                            secureuri: false,  //是否启用安全提交
                            async: false,
                            dataType: 'json',   //数据类型
                            fileElementId: "fileimage", //表示文件域ID
                            success: function (data, status) {
                                if (data.status == 200) {
                                    var datalist = data.list;
                                    layer.msg(sysmsg[data.msg]);
                                    for (var i = 0; i < datalist.length; i++) {
                                        deferred.resolve("/sys/file/getImage?attachId=" + datalist[i].attachId);
                                    }
                                } else if (data.status == 100) {
                                    layer.msg(sysmsg[data.msg]);
                                } else {
                                    console.log(data.msg);
                                    layer.msg(sysmsg[data.msg]);
                                }
                            },
                            error: function (html, status, e) {
                                layer.msg('上传图片失败！');
                            }
                        });

                    });

                    $imageUrl.keyup(function () {
                        toggleBtn($imageBtn, $imageUrl.val());
                    }).val('').focus();
                }).one('hidden.bs.modal', function (event) {
                    event.stopPropagation();

                    $editable.focus();
                    $imageInput.off('change');
                    $imageUrl.off('keyup');
                    $imageBtn.off('click');
                }).modal('show');
            });
        };

        /**
         * Show video dialog and set event handlers on dialog controls.
         *
         * @param {jQuery} $dialog
         * @param {Object} videoInfo
         * @return {Promise}
         */
        this.showVideoDialog = function ($editable, $dialog, videoInfo) {
            return $.Deferred(function (deferred) {
                var $videoDialog = $dialog.find('.note-video-dialog');
                var $videoUrl = $videoDialog.find('.note-video-url'),
                    $videoBtn = $videoDialog.find('.note-video-btn');

                $videoDialog.one('shown.bs.modal', function (event) {
                    event.stopPropagation();

                    $videoUrl.val(videoInfo.text).keyup(function () {
                        toggleBtn($videoBtn, $videoUrl.val());
                    }).trigger('keyup').trigger('focus');

                    $videoBtn.click(function (event) {
                        event.preventDefault();

                        $videoDialog.modal('hide');
                        deferred.resolve($videoUrl.val());
                    });
                }).one('hidden.bs.modal', function (event) {
                    event.stopPropagation();

                    $editable.focus();
                    $videoUrl.off('keyup');
                    $videoBtn.off('click');
                }).modal('show');
            });
        };

        /**
         * Show link dialog and set event handlers on dialog controls.
         *
         * @param {jQuery} $dialog
         * @param {Object} linkInfo
         * @return {Promise}
         */
        this.showLinkDialog = function ($editable, $dialog, linkInfo) {
            return $.Deferred(function (deferred) {
                var $linkDialog = $dialog.find('.note-link-dialog');

                var $linkText = $linkDialog.find('.note-link-text'),
                    $linkUrl = $linkDialog.find('.note-link-url'),
                    $linkBtn = $linkDialog.find('.note-link-btn'),
                    $openInNewWindow = $linkDialog.find('input[type=checkbox]');

                $linkDialog.one('shown.bs.modal', function (event) {
                    event.stopPropagation();

                    $linkText.val(linkInfo.text);

                    $linkUrl.keyup(function () {
                        toggleBtn($linkBtn, $linkUrl.val());
                        // display same link on `Text to display` input
                        // when create a new link
                        if (!linkInfo.text) {
                            $linkText.val($linkUrl.val());
                        }
                    }).val(linkInfo.url).trigger('focus');

                    $openInNewWindow.prop('checked', linkInfo.newWindow);

                    $linkBtn.one('click', function (event) {
                        event.preventDefault();

                        $linkDialog.modal('hide');
                        deferred.resolve($linkUrl.val(), $openInNewWindow.is(':checked'));
                    });
                }).one('hidden.bs.modal', function (event) {
                    event.stopPropagation();

                    $editable.focus();
                    $linkUrl.off('keyup');
                }).modal('show');
            }).promise();
        };

        /**
         * show help dialog
         *
         * @param {jQuery} $dialog
         */
        this.showHelpDialog = function ($editable, $dialog) {
            var $helpDialog = $dialog.find('.note-help-dialog');

            $helpDialog.one('hidden.bs.modal', function (event) {
                event.stopPropagation();
                $editable.focus();
            }).modal('show');
        };
    };

    /**
     * EventHandler
     */
    var EventHandler = function () {
        var editor = new Editor();
        var toolbar = new Toolbar(), popover = new Popover();
        var handle = new Handle(), dialog = new Dialog();

        /**
         * returns makeLayoutInfo from editor's descendant node.
         *
         * @param {Element} descendant
         * @returns {Object}
         */
        var makeLayoutInfo = function (descendant) {
            var $editor = $(descendant).closest('.note-editor');
            return $editor.length > 0 && dom.buildLayoutInfo($editor);
        };

        /**
         * insert Images from file array.
         *
         * @param {jQuery} $editable
         * @param {File[]} files
         */
        var insertImages = function ($editable, files) {
            editor.restoreRange($editable);
            var callbacks = $editable.data('callbacks');

            // If onImageUpload options setted
            if (callbacks.onImageUpload) {
                callbacks.onImageUpload(files, editor, $editable);
                // else insert Image as dataURL
            } else {
                $.each(files, function (idx, file) {
                    async.readFileAsDataURL(file).then(function (sDataURL) {
                        editor.insertImage($editable, sDataURL);
                    }).fail(function () {
                        if (callbacks.onImageUploadError) {
                            callbacks.onImageUploadError();
                        }
                    });
                });
            }
        };

        var hMousedown = function (event) {
            //preventDefault Selection for FF, IE8+
            if (dom.isImg(event.target)) {
                event.preventDefault();
            }
        };

        var hToolbarAndPopoverUpdate = function (event) {
            var oLayoutInfo = makeLayoutInfo(event.currentTarget || event.target);
            var oStyle = editor.currentStyle(event.target);
            if (!oStyle) {
                return;
            }
            toolbar.update(oLayoutInfo.toolbar(), oStyle);
            popover.update(oLayoutInfo.popover(), oStyle);
            handle.update(oLayoutInfo.handle(), oStyle);
        };

        var hScroll = function (event) {
            var oLayoutInfo = makeLayoutInfo(event.currentTarget || event.target);
            //hide popover and handle when scrolled
            popover.hide(oLayoutInfo.popover());
            handle.hide(oLayoutInfo.handle());
        };

        /**
         * `mousedown` event handler on $handle
         *  - controlSizing: resize image
         *
         * @param {MouseEvent} event
         */
        var hHandleMousedown = function (event) {
            if (dom.isControlSizing(event.target)) {
                var oLayoutInfo = makeLayoutInfo(event.target),
                    $handle = oLayoutInfo.handle(), $popover = oLayoutInfo.popover(),
                    $editable = oLayoutInfo.editable(), $editor = oLayoutInfo.editor();

                var elTarget = $handle.find('.note-control-selection').data('target'),
                    $target = $(elTarget);
                var posStart = $target.offset(),
                    scrollTop = $(document).scrollTop();

                $editor.on('mousemove', function (event) {

                    editor.resizeTo({
                        x: event.clientX - posStart.left,
                        y: event.clientY - (posStart.top - scrollTop)
                    }, $target, !event.shiftKey);

                    handle.update($handle, {image: elTarget});
                    popover.update($popover, {image: elTarget});
                }).one('mouseup', function () {
                    $editor.off('mousemove');
                });

                if (!$target.data('ratio')) { // original ratio.
                    $target.data('ratio', $target.height() / $target.width());
                }

                editor.recordUndo($editable);
                event.stopPropagation();
                event.preventDefault();
            }
        };

        var hToolbarAndPopoverMousedown = function (event) {
            // prevent default event when insertTable (FF, Webkit)
            var $btn = $(event.target).closest('[data-event]');
            if ($btn.length > 0) {
                event.preventDefault();
            }
        };

        var hToolbarAndPopoverClick = function (event) {
            var $btn = $(event.target).closest('[data-event]');

            if ($btn.length > 0) {
                var sEvent = $btn.attr('data-event'),
                    sValue = $btn.attr('data-value');

                var oLayoutInfo = makeLayoutInfo(event.target);
                var $editor = oLayoutInfo.editor(),
                    $toolbar = oLayoutInfo.toolbar(),
                    $dialog = oLayoutInfo.dialog(),
                    $editable = oLayoutInfo.editable(),
                    $codable = oLayoutInfo.codable();

                var server;
                var cmEditor;

                var options = $editor.data('options');

                // before command: detect control selection element($target)
                var $target;
                if ($.inArray(sEvent, ['resize', 'floatMe', 'removeMedia']) !== -1) {
                    var $handle = oLayoutInfo.handle();
                    var $selection = $handle.find('.note-control-selection');
                    $target = $($selection.data('target'));
                }

                if (editor[sEvent]) { // on command
                    $editable.trigger('focus');
                    editor[sEvent]($editable, sValue, $target);
                }

                // after command
                if ($.inArray(sEvent, ['backColor', 'foreColor']) !== -1) {
                    toolbar.updateRecentColor($btn[0], sEvent, sValue);
                } else if (sEvent === 'showLinkDialog') { // popover to dialog
                    $editable.focus();
                    var linkInfo = editor.getLinkInfo();

                    editor.saveRange($editable);
                    dialog.showLinkDialog($editable, $dialog, linkInfo).then(function (sLinkUrl, bNewWindow) {
                        editor.restoreRange($editable);
                        editor.createLink($editable, sLinkUrl, bNewWindow);
                    });
                } else if (sEvent === 'showImageDialog') {
                    $editable.focus();

                    dialog.showImageDialog($editable, $dialog).then(function (data) {
                        if (typeof data === 'string') {
                            editor.restoreRange($editable);
                            editor.insertImage($editable, data);
                        } else {
                            insertImages($editable, data);
                        }
                    });
                } else if (sEvent === 'showVideoDialog') {
                    $editable.focus();
                    var videoInfo = editor.getVideoInfo();

                    editor.saveRange($editable);
                    dialog.showVideoDialog($editable, $dialog, videoInfo).then(function (sUrl) {
                        editor.restoreRange($editable);
                        editor.insertVideo($editable, sUrl);
                    });
                } else if (sEvent === 'showHelpDialog') {
                    dialog.showHelpDialog($editable, $dialog);
                } else if (sEvent === 'fullscreen') {
                    var $scrollbar = $('html, body');

                    var resize = function (size) {
                        $editor.css('width', size.w);
                        $editable.css('height', size.h);
                        $codable.css('height', size.h);
                        if ($codable.data('cmEditor')) {
                            $codable.data('cmEditor').setSize(null, size.h);
                        }
                    };

                    $editor.toggleClass('fullscreen');
                    var isFullscreen = $editor.hasClass('fullscreen');
                    if (isFullscreen) {
                        $editable.data('orgHeight', $editable.css('height'));

                        $(window).on('resize', function () {
                            resize({
                                w: $(window).width(),
                                h: $(window).height() - $toolbar.outerHeight()
                            });
                        }).trigger('resize');

                        $scrollbar.css('overflow', 'hidden');
                    } else {
                        $(window).off('resize');
                        resize({
                            w: options.width || '',
                            h: $editable.data('orgHeight')
                        });
                        $scrollbar.css('overflow', 'auto');
                    }
                    toolbar.updateFullscreen($toolbar, isFullscreen);
                } else if (sEvent === 'codeview') {
                    $editor.toggleClass('codeview');

                    var bCodeview = $editor.hasClass('codeview');
                    if (bCodeview) {
                        $codable.val($editable.html());
                        $codable.height($editable.height());
                        toolbar.deactivate($toolbar);
                        $codable.focus();

                        // activate CodeMirror as codable
                        if (agent.bCodeMirror) {
                            cmEditor = CodeMirror.fromTextArea($codable[0], $.extend({
                                mode: 'text/html',
                                lineNumbers: true
                            }, options.codemirror));
                            var tern = $editor.data('options').codemirror.tern || false;
                            if (tern) {
                                server = new CodeMirror.TernServer(tern);
                                cmEditor.ternServer = server;
                                cmEditor.on('cursorActivity', function (cm) {
                                    server.updateArgHints(cm);
                                });
                            }

                            // CodeMirror hasn't Padding.
                            cmEditor.setSize(null, $editable.outerHeight());
                            // autoFormatRange If formatting included
                            if (cmEditor.autoFormatRange) {
                                cmEditor.autoFormatRange({line: 0, ch: 0}, {
                                    line: cmEditor.lineCount(),
                                    ch: cmEditor.getTextArea().value.length
                                });
                            }
                            $codable.data('cmEditor', cmEditor);
                        }
                    } else {
                        // deactivate CodeMirror as codable
                        if (agent.bCodeMirror) {
                            cmEditor = $codable.data('cmEditor');
                            $codable.val(cmEditor.getValue());
                            cmEditor.toTextArea();
                        }

                        $editable.html($codable.val() || dom.emptyPara);
                        $editable.height(options.height ? $codable.height() : 'auto');

                        toolbar.activate($toolbar);
                        $editable.focus();
                    }

                    toolbar.updateCodeview(oLayoutInfo.toolbar(), bCodeview);
                }

                hToolbarAndPopoverUpdate(event);
            }
        };

        var EDITABLE_PADDING = 24;
        /**
         * `mousedown` event handler on statusbar
         *
         * @param {MouseEvent} event
         */
        var hStatusbarMousedown = function (event) {
            var $document = $(document);
            var $editable = makeLayoutInfo(event.target).editable();
            var nEditableTop = $editable.offset().top - $document.scrollTop();

            $document.on('mousemove', function (event) {
                var nHeight = event.clientY - (nEditableTop + EDITABLE_PADDING);
                $editable.height(nHeight);
            }).one('mouseup', function () {
                $document.off('mousemove');
            });

            event.stopPropagation();
            event.preventDefault();
        };

        var PX_PER_EM = 18;
        var hDimensionPickerMove = function (event) {
            var $picker = $(event.target.parentNode); // target is mousecatcher
            var $dimensionDisplay = $picker.next();
            var $catcher = $picker.find('.note-dimension-picker-mousecatcher');
            var $highlighted = $picker.find('.note-dimension-picker-highlighted');
            var $unhighlighted = $picker.find('.note-dimension-picker-unhighlighted');

            var posOffset;
            // HTML5 with jQuery - e.offsetX is undefined in Firefox
            if (event.offsetX === undefined) {
                var posCatcher = $(event.target).offset();
                posOffset = {
                    x: event.pageX - posCatcher.left,
                    y: event.pageY - posCatcher.top
                };
            } else {
                posOffset = {
                    x: event.offsetX,
                    y: event.offsetY
                };
            }

            var dim = {
                c: Math.ceil(posOffset.x / PX_PER_EM) || 1,
                r: Math.ceil(posOffset.y / PX_PER_EM) || 1
            };

            $highlighted.css({width: dim.c + 'em', height: dim.r + 'em'});
            $catcher.attr('data-value', dim.c + 'x' + dim.r);

            if (3 < dim.c && dim.c < 10) { // 5~10
                $unhighlighted.css({width: dim.c + 1 + 'em'});
            }

            if (3 < dim.r && dim.r < 10) { // 5~10
                $unhighlighted.css({height: dim.r + 1 + 'em'});
            }

            $dimensionDisplay.html(dim.c + ' x ' + dim.r);
        };

        /**
         * attach Drag and Drop Events
         *
         * @param {Object} oLayoutInfo - layout Informations
         */
        var attachDragAndDropEvent = function (oLayoutInfo) {
            var collection = $(), $dropzone = oLayoutInfo.dropzone,
                $dropzoneMessage = oLayoutInfo.dropzone.find('.note-dropzone-message');

            // show dropzone on dragenter when dragging a object to document.
            $(document).on('dragenter', function (e) {
                var bCodeview = oLayoutInfo.editor.hasClass('codeview');
                if (!bCodeview && collection.length === 0) {
                    oLayoutInfo.editor.addClass('dragover');
                    $dropzone.width(oLayoutInfo.editor.width());
                    $dropzone.height(oLayoutInfo.editor.height());
                    $dropzoneMessage.text('Drag Image Here');
                }
                collection = collection.add(e.target);
            }).on('dragleave', function (e) {
                collection = collection.not(e.target);
                if (collection.length === 0) {
                    oLayoutInfo.editor.removeClass('dragover');
                }
            }).on('drop', function () {
                collection = $();
                oLayoutInfo.editor.removeClass('dragover');
            });

            // change dropzone's message on hover.
            $dropzone.on('dragenter', function () {
                $dropzone.addClass('hover');
                $dropzoneMessage.text('Drop Image');
            }).on('dragleave', function () {
                $dropzone.removeClass('hover');
                $dropzoneMessage.text('Drag Image Here');
            });

            // attach dropImage
            $dropzone.on('drop', function (event) {
                var dataTransfer = event.originalEvent.dataTransfer;
                if (dataTransfer && dataTransfer.files) {
                    var oLayoutInfo = makeLayoutInfo(event.currentTarget || event.target);
                    oLayoutInfo.editable().focus();
                    insertImages(oLayoutInfo.editable(), dataTransfer.files);
                }
                event.preventDefault();
            }).on('dragover', false); // prevent default dragover event
        };


        /**
         * bind KeyMap on keydown
         *
         * @param {Object} oLayoutInfo
         * @param {Object} keyMap
         */
        this.bindKeyMap = function (oLayoutInfo, keyMap) {
            var $editor = oLayoutInfo.editor;
            var $editable = oLayoutInfo.editable;

            $editable.on('keydown', function (event) {
                var aKey = [];

                // modifier
                if (event.metaKey) {
                    aKey.push('CMD');
                }
                if (event.ctrlKey) {
                    aKey.push('CTRL');
                }
                if (event.shiftKey) {
                    aKey.push('SHIFT');
                }

                // keycode
                var keyName = key.nameFromCode[event.keyCode];
                if (keyName) {
                    aKey.push(keyName);
                }

                var handler = keyMap[aKey.join('+')];
                if (handler) {
                    event.preventDefault();

                    editor[handler]($editable, $editor.data('options'));
                } else if (key.isEdit(event.keyCode)) {
                    editor.recordUndo($editable);
                }
            });
        };

        /**
         * attach eventhandler
         *
         * @param {Object} oLayoutInfo - layout Informations
         * @param {Object} options - user options include custom event handlers
         * @param {Function} options.enter - enter key handler
         */
        this.attach = function (oLayoutInfo, options) {
            var keyMap = options.keyMap[agent.bMac ? 'mac' : 'pc'];
            this.bindKeyMap(oLayoutInfo, keyMap);

            oLayoutInfo.editable.on('mousedown', hMousedown);
            oLayoutInfo.editable.on('keyup mouseup', hToolbarAndPopoverUpdate);
            oLayoutInfo.editable.on('scroll', hScroll);

            // Doesn't attach `dragAndDrop` event when `options.disableDragAndDrop` is true
            if (!options.disableDragAndDrop) {
                attachDragAndDropEvent(oLayoutInfo);
            }

            oLayoutInfo.handle.on('mousedown', hHandleMousedown);

            oLayoutInfo.toolbar.on('click', hToolbarAndPopoverClick);
            oLayoutInfo.popover.on('click', hToolbarAndPopoverClick);
            oLayoutInfo.toolbar.on('mousedown', hToolbarAndPopoverMousedown);
            oLayoutInfo.popover.on('mousedown', hToolbarAndPopoverMousedown);
            oLayoutInfo.statusbar.on('mousedown', hStatusbarMousedown);

            //toolbar table dimension
            var $toolbar = oLayoutInfo.toolbar;
            var $catcher = $toolbar.find('.note-dimension-picker-mousecatcher');
            $catcher.on('mousemove', hDimensionPickerMove);

            // save selection when focusout
            oLayoutInfo.editable.on('blur', function () {
                editor.saveRange(oLayoutInfo.editable);
            });

            // save options on editor
            oLayoutInfo.editor.data('options', options);

            // ret styleWithCSS for backColor / foreColor clearing with 'inherit'.
            if (options.styleWithSpan && !agent.bMSIE) {
                // protect FF Error: NS_ERROR_FAILURE: Failure
                setTimeout(function () {
                    document.execCommand('styleWithCSS', 0, true);
                });
            }

            // History
            oLayoutInfo.editable.data('NoteHistory', new History());

            // basic event callbacks (lowercase)
            // enter, focus, blur, keyup, keydown
            if (options.onenter) {
                oLayoutInfo.editable.keypress(function (event) {
                    if (event.keyCode === key.ENTER) {
                        options.onenter(event);
                    }
                });
            }
            if (options.onfocus) {
                oLayoutInfo.editable.focus(options.onfocus);
            }
            if (options.onblur) {
                oLayoutInfo.editable.blur(options.onblur);
            }
            if (options.onkeyup) {
                oLayoutInfo.editable.keyup(options.onkeyup);
            }
            if (options.onkeydown) {
                oLayoutInfo.editable.keydown(options.onkeydown);
            }
            if (options.onpaste) {
                oLayoutInfo.editable.on('paste', options.onpaste);
            }
            if (options.onToolbarClick) {
                oLayoutInfo.toolbar.click(options.onToolbarClick);
            }

            // callbacks for advanced features (camel)
            // All editor status will be saved on editable with jquery's data
            // for support multiple editor with singleton object.
            oLayoutInfo.editable.data('callbacks', {
                onChange: options.onChange,
                onAutoSave: options.onAutoSave,
                onImageUpload: options.onImageUpload,
                onImageUploadError: options.onImageUploadError,
                onFileUpload: options.onFileUpload,
                onFileUploadError: options.onFileUpload
            });
        };

        this.dettach = function (oLayoutInfo) {
            oLayoutInfo.editable.off();
            oLayoutInfo.toolbar.off();
            oLayoutInfo.handle.off();
            oLayoutInfo.popover.off();
        };
    };

    /**
     * renderer
     *
     * rendering toolbar and editable
     */
    var Renderer = function () {
        var tplToolbarInfo, tplPopover, tplHandle, tplDialog, tplStatusbar;

        /* jshint ignore:start */
        tplToolbarInfo = {
            picture: function (lang) {
                return '<button type="button" class="btn btn-default btn-sm btn-small" title="' + lang.image.image + '" data-event="showImageDialog" tabindex="-1"><i class="fa fa-picture-o icon-picture"></i></button>';
            },
            link: function (lang) {
                return '<button type="button" class="btn btn-default btn-sm btn-small" title="' + lang.link.link + '" data-event="showLinkDialog" tabindex="-1"><i class="fa fa-link icon-link"></i></button>';
            },
            video: function (lang) {
                return '<button type="button" class="btn btn-default btn-sm btn-small" title="' + lang.video.video + '" data-event="showVideoDialog" tabindex="-1"><i class="fa fa-youtube-play icon-play"></i></button>';
            },
            table: function (lang) {
                return '<button type="button" class="btn btn-default btn-sm btn-small dropdown-toggle" title="' + lang.table.table + '" data-toggle="dropdown" tabindex="-1"><i class="fa fa-table icon-table"></i> <span class="caret"></span></button>' +
                    '<ul class="dropdown-menu">' +
                    '<div class="note-dimension-picker">' +
                    '<div class="note-dimension-picker-mousecatcher" data-event="insertTable" data-value="1x1"></div>' +
                    '<div class="note-dimension-picker-highlighted"></div>' +
                    '<div class="note-dimension-picker-unhighlighted"></div>' +
                    '</div>' +
                    '<div class="note-dimension-display"> 1 x 1 </div>' +
                    '</ul>';
            },
            style: function (lang) {
                return '<button type="button" class="btn btn-default btn-sm btn-small dropdown-toggle" title="' + lang.style.style + '" data-toggle="dropdown" tabindex="-1"><i class="fa fa-magic icon-magic"></i> <span class="caret"></span></button>' +
                    '<ul class="dropdown-menu">' +
                    '<li><a data-event="formatBlock" data-value="p">' + lang.style.normal + '</a></li>' +
                    '<li><a data-event="formatBlock" data-value="blockquote"><blockquote>' + lang.style.blockquote + '</blockquote></a></li>' +
                    '<li><a data-event="formatBlock" data-value="pre">' + lang.style.pre + '</a></li>' +
                    '<li><a data-event="formatBlock" data-value="h1"><h1>' + lang.style.h1 + '</h1></a></li>' +
                    '<li><a data-event="formatBlock" data-value="h2"><h2>' + lang.style.h2 + '</h2></a></li>' +
                    '<li><a data-event="formatBlock" data-value="h3"><h3>' + lang.style.h3 + '</h3></a></li>' +
                    '<li><a data-event="formatBlock" data-value="h4"><h4>' + lang.style.h4 + '</h4></a></li>' +
                    '<li><a data-event="formatBlock" data-value="h5"><h5>' + lang.style.h5 + '</h5></a></li>' +
                    '<li><a data-event="formatBlock" data-value="h6"><h6>' + lang.style.h6 + '</h6></a></li>' +
                    '</ul>';
            },
            fontname: function (lang) {
                var aFont = [
                    'Serif', 'Sans', 'Arial', 'Arial Black', 'Courier',
                    'Courier New', 'Comic Sans MS', 'Helvetica', 'Impact', 'Lucida Grande',
                    'Lucida Sans', 'Tahoma', 'Times', 'Times New Roman', 'Verdana'
                ];

                var sMarkup = '<button type="button" class="btn btn-default btn-sm btn-small dropdown-toggle" data-toggle="dropdown" title="' + lang.font.name + '" tabindex="-1"><span class="note-current-fontname">Arial</span> <b class="caret"></b></button>';
                sMarkup += '<ul class="dropdown-menu">';
                for (var idx = 0; idx < aFont.length; idx++) {
                    sMarkup += '<li><a data-event="fontName" data-value="' + aFont[idx] + '"><i class="fa fa-check icon-ok"></i> ' + aFont[idx] + '</a></li>';
                }
                sMarkup += '</ul>';

                return sMarkup;
            },
            fontsize: function (lang) {
                return '<button type="button" class="btn btn-default btn-sm btn-small dropdown-toggle" data-toggle="dropdown" title="' + lang.font.size + '" tabindex="-1"><span class="note-current-fontsize">11</span> <b class="caret"></b></button>' +
                    '<ul class="dropdown-menu">' +
                    '<li><a data-event="fontSize" data-value="8"><i class="fa fa-check icon-ok"></i> 8</a></li>' +
                    '<li><a data-event="fontSize" data-value="9"><i class="fa fa-check icon-ok"></i> 9</a></li>' +
                    '<li><a data-event="fontSize" data-value="10"><i class="fa fa-check icon-ok"></i> 10</a></li>' +
                    '<li><a data-event="fontSize" data-value="11"><i class="fa fa-check icon-ok"></i> 11</a></li>' +
                    '<li><a data-event="fontSize" data-value="12"><i class="fa fa-check icon-ok"></i> 12</a></li>' +
                    '<li><a data-event="fontSize" data-value="14"><i class="fa fa-check icon-ok"></i> 14</a></li>' +
                    '<li><a data-event="fontSize" data-value="18"><i class="fa fa-check icon-ok"></i> 18</a></li>' +
                    '<li><a data-event="fontSize" data-value="24"><i class="fa fa-check icon-ok"></i> 24</a></li>' +
                    '<li><a data-event="fontSize" data-value="36"><i class="fa fa-check icon-ok"></i> 36</a></li>' +
                    '</ul>';
            },
            color: function (lang) {
                return '<button type="button" class="btn btn-default btn-sm btn-small note-recent-color" title="' + lang.color.recent + '" data-event="color" data-value=\'{"backColor":"yellow"}\' tabindex="-1"><i class="fa fa-font icon-font" style="color:black;background-color:yellow;"></i></button>' +
                    '<button type="button" class="btn btn-default btn-sm btn-small dropdown-toggle" title="' + lang.color.more + '" data-toggle="dropdown" tabindex="-1">' +
                    '<span class="caret"></span>' +
                    '</button>' +
                    '<ul class="dropdown-menu">' +
                    '<li>' +
                    '<div class="btn-group">' +
                    '<div class="note-palette-title">' + lang.color.background + '</div>' +
                    '<div class="note-color-reset" data-event="backColor" data-value="inherit" title="' + lang.color.transparent + '">' + lang.color.setTransparent + '</div>' +
                    '<div class="note-color-palette" data-target-event="backColor"></div>' +
                    '</div>' +
                    '<div class="btn-group">' +
                    '<div class="note-palette-title">' + lang.color.foreground + '</div>' +
                    '<div class="note-color-reset" data-event="foreColor" data-value="inherit" title="' + lang.color.reset + '">' + lang.color.resetToDefault + '</div>' +
                    '<div class="note-color-palette" data-target-event="foreColor"></div>' +
                    '</div>' +
                    '</li>' +
                    '</ul>';
            },
            bold: function (lang) {
                return '<button type="button" class="btn btn-default btn-sm btn-small" title="' + lang.font.bold + '" data-shortcut="Ctrl+B" data-mac-shortcut="⌘+B" data-event="bold" tabindex="-1"><i class="fa fa-bold icon-bold"></i></button>';
            },
            italic: function (lang) {
                return '<button type="button" class="btn btn-default btn-sm btn-small" title="' + lang.font.italic + '" data-shortcut="Ctrl+I" data-mac-shortcut="⌘+I" data-event="italic" tabindex="-1"><i class="fa fa-italic icon-italic"></i></button>';
            },
            underline: function (lang) {
                return '<button type="button" class="btn btn-default btn-sm btn-small" title="' + lang.font.underline + '" data-shortcut="Ctrl+U" data-mac-shortcut="⌘+U" data-event="underline" tabindex="-1"><i class="fa fa-underline icon-underline"></i></button>';
            },
            clear: function (lang) {
                return '<button type="button" class="btn btn-default btn-sm btn-small" title="' + lang.font.clear + '" data-shortcut="Ctrl+\\" data-mac-shortcut="⌘+\\" data-event="removeFormat" tabindex="-1"><i class="fa fa-eraser icon-eraser"></i></button>';
            },
            ul: function (lang) {
                return '<button type="button" class="btn btn-default btn-sm btn-small" title="' + lang.lists.unordered + '" data-shortcut="Ctrl+Shift+8" data-mac-shortcut="⌘+⇧+7" data-event="insertUnorderedList" tabindex="-1"><i class="fa fa-list-ul icon-list-ul"></i></button>';
            },
            ol: function (lang) {
                return '<button type="button" class="btn btn-default btn-sm btn-small" title="' + lang.lists.ordered + '" data-shortcut="Ctrl+Shift+7" data-mac-shortcut="⌘+⇧+8" data-event="insertOrderedList" tabindex="-1"><i class="fa fa-list-ol icon-list-ol"></i></button>';
            },
            paragraph: function (lang) {
                return '<button type="button" class="btn btn-default btn-sm btn-small dropdown-toggle" title="' + lang.paragraph.paragraph + '" data-toggle="dropdown" tabindex="-1"><i class="fa fa-align-left icon-align-left"></i>  <span class="caret"></span></button>' +
                    '<div class="dropdown-menu">' +
                    '<div class="note-align btn-group">' +
                    '<button type="button" class="btn btn-default btn-sm btn-small" title="' + lang.paragraph.left + '" data-shortcut="Ctrl+Shift+L" data-mac-shortcut="⌘+⇧+L" data-event="justifyLeft" tabindex="-1"><i class="fa fa-align-left icon-align-left"></i></button>' +
                    '<button type="button" class="btn btn-default btn-sm btn-small" title="' + lang.paragraph.center + '" data-shortcut="Ctrl+Shift+E" data-mac-shortcut="⌘+⇧+E" data-event="justifyCenter" tabindex="-1"><i class="fa fa-align-center icon-align-center"></i></button>' +
                    '<button type="button" class="btn btn-default btn-sm btn-small" title="' + lang.paragraph.right + '" data-shortcut="Ctrl+Shift+R" data-mac-shortcut="⌘+⇧+R" data-event="justifyRight" tabindex="-1"><i class="fa fa-align-right icon-align-right"></i></button>' +
                    '<button type="button" class="btn btn-default btn-sm btn-small" title="' + lang.paragraph.justify + '" data-shortcut="Ctrl+Shift+J" data-mac-shortcut="⌘+⇧+J" data-event="justifyFull" tabindex="-1"><i class="fa fa-align-justify icon-align-justify"></i></button>' +
                    '</div>' +
                    '<div class="note-list btn-group">' +
                    '<button type="button" class="btn btn-default btn-sm btn-small" title="' + lang.paragraph.outdent + '" data-shortcut="Ctrl+[" data-mac-shortcut="⌘+[" data-event="outdent" tabindex="-1"><i class="fa fa-outdent icon-indent-left"></i></button>' +
                    '<button type="button" class="btn btn-default btn-sm btn-small" title="' + lang.paragraph.indent + '" data-shortcut="Ctrl+]" data-mac-shortcut="⌘+]" data-event="indent" tabindex="-1"><i class="fa fa-indent icon-indent-right"></i></button>' +
                    '</div>' +
                    '</div>';
            },
            height: function (lang) {
                return '<button type="button" class="btn btn-default btn-sm btn-small dropdown-toggle" data-toggle="dropdown" title="' + lang.font.height + '" tabindex="-1"><i class="fa fa-text-height icon-text-height"></i>&nbsp; <b class="caret"></b></button>' +
                    '<ul class="dropdown-menu">' +
                    '<li><a data-event="lineHeight" data-value="1.0"><i class="fa fa-check icon-ok"></i> 1.0</a></li>' +
                    '<li><a data-event="lineHeight" data-value="1.2"><i class="fa fa-check icon-ok"></i> 1.2</a></li>' +
                    '<li><a data-event="lineHeight" data-value="1.4"><i class="fa fa-check icon-ok"></i> 1.4</a></li>' +
                    '<li><a data-event="lineHeight" data-value="1.5"><i class="fa fa-check icon-ok"></i> 1.5</a></li>' +
                    '<li><a data-event="lineHeight" data-value="1.6"><i class="fa fa-check icon-ok"></i> 1.6</a></li>' +
                    '<li><a data-event="lineHeight" data-value="1.8"><i class="fa fa-check icon-ok"></i> 1.8</a></li>' +
                    '<li><a data-event="lineHeight" data-value="2.0"><i class="fa fa-check icon-ok"></i> 2.0</a></li>' +
                    '<li><a data-event="lineHeight" data-value="3.0"><i class="fa fa-check icon-ok"></i> 3.0</a></li>' +
                    '</ul>';
            },
            help: function (lang) {
                return '<button type="button" class="btn btn-default btn-sm btn-small" title="' + lang.options.help + '" data-event="showHelpDialog" tabindex="-1"><i class="fa fa-question icon-question"></i></button>';
            },
            fullscreen: function (lang) {
                return '<button type="button" class="btn btn-default btn-sm btn-small" title="' + lang.options.fullscreen + '" data-event="fullscreen" tabindex="-1"><i class="fa fa-arrows-alt icon-fullscreen"></i></button>';
            },
            codeview: function (lang) {
                return '<button type="button" class="btn btn-default btn-sm btn-small" title="' + lang.options.codeview + '" data-event="codeview" tabindex="-1"><i class="fa fa-code icon-code"></i></button>';
            },
            undo: function (lang) {
                return '<button type="button" class="btn btn-default btn-sm btn-small" title="' + lang.history.undo + '" data-event="undo" tabindex="-1"><i class="fa fa-undo icon-undo"></i></button>';
            },
            redo: function (lang) {
                return '<button type="button" class="btn btn-default btn-sm btn-small" title="' + lang.history.redo + '" data-event="redo" tabindex="-1"><i class="fa fa-repeat icon-repeat"></i></button>';
            }
        };
        tplPopover = function (lang) {
            return '<div class="note-popover">' +
                '<div class="note-link-popover popover bottom in" style="display: none;">' +
                '<div class="arrow"></div>' +
                '<div class="popover-content note-link-content">' +
                '<a href="../www.google.com" target="_blank">www.google.com</a>&nbsp;&nbsp;' +
                '<div class="note-insert btn-group">' +
                '<button type="button" class="btn btn-default btn-sm btn-small" title="' + lang.link.edit + '" data-event="showLinkDialog" tabindex="-1"><i class="fa fa-edit icon-edit"></i></button>' +
                '<button type="button" class="btn btn-default btn-sm btn-small" title="' + lang.link.unlink + '" data-event="unlink" tabindex="-1"><i class="fa fa-unlink icon-unlink"></i></button>' +
                '</div>' +
                '</div>' +
                '</div>' +
                '<div class="note-image-popover popover bottom in" style="display: none;">' +
                '<div class="arrow"></div>' +
                '<div class="popover-content note-image-content">' +
                '<div class="btn-group">' +
                '<button type="button" class="btn btn-default btn-sm btn-small" title="' + lang.image.resizeFull + '" data-event="resize" data-value="1" tabindex="-1"><span class="note-fontsize-10">100%</span> </button>' +
                '<button type="button" class="btn btn-default btn-sm btn-small" title="' + lang.image.resizeHalf + '" data-event="resize" data-value="0.5" tabindex="-1"><span class="note-fontsize-10">50%</span> </button>' +
                '<button type="button" class="btn btn-default btn-sm btn-small" title="' + lang.image.resizeQuarter + '" data-event="resize" data-value="0.25" tabindex="-1"><span class="note-fontsize-10">25%</span> </button>' +
                '</div>' +
                '<div class="btn-group">' +
                '<button type="button" class="btn btn-default btn-sm btn-small" title="' + lang.image.floatLeft + '" data-event="floatMe" data-value="left" tabindex="-1"><i class="fa fa-align-left icon-align-left"></i></button>' +
                '<button type="button" class="btn btn-default btn-sm btn-small" title="' + lang.image.floatRight + '" data-event="floatMe" data-value="right" tabindex="-1"><i class="fa fa-align-right icon-align-right"></i></button>' +
                '<button type="button" class="btn btn-default btn-sm btn-small" title="' + lang.image.floatNone + '" data-event="floatMe" data-value="none" tabindex="-1"><i class="fa fa-align-justify icon-align-justify"></i></button>' +
                '</div>' +
                '<div class="btn-group">' +
                '<button type="button" class="btn btn-default btn-sm btn-small" title="' + lang.image.remove + '" data-event="removeMedia" data-value="none" tabindex="-1"><i class="fa fa-trash-o icon-trash"></i></button>' +
                '</div>' +
                '</div>' +
                '</div>' +
                '</div>';
        };

        var tplHandle = function () {
            return '<div class="note-handle">' +
                '<div class="note-control-selection">' +
                '<div class="note-control-selection-bg"></div>' +
                '<div class="note-control-holder note-control-nw"></div>' +
                '<div class="note-control-holder note-control-ne"></div>' +
                '<div class="note-control-holder note-control-sw"></div>' +
                '<div class="note-control-sizing note-control-se"></div>' +
                '<div class="note-control-selection-info"></div>' +
                '</div>' +
                '</div>';
        };

        var tplShortcutText = function (lang, options) {
            return '<table class="note-shortcut">' +
                '<thead>' +
                '<tr><th></th><th>' + lang.shortcut.textFormatting + '</th></tr>' +
                '</thead>' +
                '<tbody>' +
                '<tr><td>⌘ + B</td><td>' + lang.font.bold + '</td></tr>' +
                '<tr><td>⌘ + I</td><td>' + lang.font.italic + '</td></tr>' +
                '<tr><td>⌘ + U</td><td>' + lang.font.underline + '</td></tr>' +
                '<tr><td>⌘ + ⇧ + S</td><td>' + lang.font.strike + '</td></tr>' +
                '<tr><td>⌘ + \\</td><td>' + lang.font.clear + '</td></tr>' +
                '</tr>' +
                '</tbody>' +
                '</table>';
        };

        var tplShortcutAction = function (lang, options) {
            return '<table class="note-shortcut">' +
                '<thead>' +
                '<tr><th></th><th>' + lang.shortcut.action + '</th></tr>' +
                '</thead>' +
                '<tbody>' +
                '<tr><td>⌘ + Z</td><td>' + lang.history.undo + '</td></tr>' +
                '<tr><td>⌘ + ⇧ + Z</td><td>' + lang.history.redo + '</td></tr>' +
                '<tr><td>⌘ + ]</td><td>' + lang.paragraph.indent + '</td></tr>' +
                '<tr><td>⌘ + [</td><td>' + lang.paragraph.outdent + '</td></tr>' +
                '<tr><td>⌘ + ENTER</td><td>' + lang.hr.insert + '</td></tr>' +
                '</tbody>' +
                '</table>';
        };

        var tplExtraShortcuts = function (lang, options) {
            var template =
                '<table class="note-shortcut">' +
                '<thead>' +
                '<tr><th></th><th>' + lang.shortcut.extraKeys + '</th></tr>' +
                '</thead>' +
                '<tbody>';
            for (var key in options.extraKeys) {
                if (!options.extraKeys.hasOwnProperty(key)) {
                    continue;
                }
                template += '<tr><td>' + key + '</td><td>' + options.extraKeys[key] + '</td></tr>';
            }
            template += '</tbody></table>';
            return template;
        };

        var tplShortcutPara = function (lang, options) {
            return '<table class="note-shortcut">' +
                '<thead>' +
                '<tr><th></th><th>' + lang.shortcut.paragraphFormatting + '</th></tr>' +
                '</thead>' +
                '<tbody>' +
                '<tr><td>⌘ + ⇧ + L</td><td>' + lang.paragraph.left + '</td></tr>' +
                '<tr><td>⌘ + ⇧ + E</td><td>' + lang.paragraph.center + '</td></tr>' +
                '<tr><td>⌘ + ⇧ + R</td><td>' + lang.paragraph.right + '</td></tr>' +
                '<tr><td>⌘ + ⇧ + J</td><td>' + lang.paragraph.justify + '</td></tr>' +
                '<tr><td>⌘ + ⇧ + NUM7</td><td>' + lang.lists.ordered + '</td></tr>' +
                '<tr><td>⌘ + ⇧ + NUM8</td><td>' + lang.lists.unordered + '</td></tr>' +
                '</tbody>' +
                '</table>';
        };

        var tplShortcutStyle = function (lang, options) {
            return '<table class="note-shortcut">' +
                '<thead>' +
                '<tr><th></th><th>' + lang.shortcut.documentStyle + '</th></tr>' +
                '</thead>' +
                '<tbody>' +
                '<tr><td>⌘ + NUM0</td><td>' + lang.style.normal + '</td></tr>' +
                '<tr><td>⌘ + NUM1</td><td>' + lang.style.h1 + '</td></tr>' +
                '<tr><td>⌘ + NUM2</td><td>' + lang.style.h2 + '</td></tr>' +
                '<tr><td>⌘ + NUM3</td><td>' + lang.style.h3 + '</td></tr>' +
                '<tr><td>⌘ + NUM4</td><td>' + lang.style.h4 + '</td></tr>' +
                '<tr><td>⌘ + NUM5</td><td>' + lang.style.h5 + '</td></tr>' +
                '<tr><td>⌘ + NUM6</td><td>' + lang.style.h6 + '</td></tr>' +
                '</tbody>' +
                '</table>';
        };

        var tplShortcutTable = function (lang, options) {
            var template = '<table class="note-shortcut-layout">' +
                '<tbody>' +
                '<tr><td>' + tplShortcutAction(lang, options) + '</td><td>' + tplShortcutText(lang, options) + '</td></tr>' +
                '<tr><td>' + tplShortcutStyle(lang, options) + '</td><td>' + tplShortcutPara(lang, options) + '</td></tr>';
            if (options.extraKeys) {
                template += '<tr><td colspan="2">' + tplExtraShortcuts(lang, options) + '</td></tr>';
            }
            template += '</tbody</table>';
            return template;
        };

        var replaceMacKeys = function (sHtml) {
            return sHtml.replace(/⌘/g, 'Ctrl').replace(/⇧/g, 'Shift');
        };

        tplDialog = function (lang, options) {
            var tplImageDialog = function () {
                return '<div class="note-image-dialog modal" aria-hidden="false">' +
                    '<div class="modal-dialog">' +
                    '<div class="modal-content">' +
                    '<div class="modal-header">' +
                    '<button type="button" class="close" aria-hidden="true" tabindex="-1">&times;</button>' +
                    '<h4>' + lang.image.insert + '</h4>' +
                    '</div>' +
                    '<div class="modal-body">' +
                    '<div class="row-fluid">' +
                    '<h5>' + lang.image.selectFromFiles + '</h5>' +
                    '<input class="note-image-input" type="file" id="fileimage" name="file" accept="image/*"/>' +
                    '</div>' +
                    '</div>' +
                    '<div class="modal-footer">' +
                    '<button href="#" class="btn btn-primary note-image-btn disabled" disabled="disabled">' + lang.image.insert + '</button>' +
                    '</div>' +
                    '</div>' +
                    '</div>' +
                    '</div>';
            };

            var tplLinkDialog = function () {
                return '<div class="note-link-dialog modal" aria-hidden="false">' +
                    '<div class="modal-dialog">' +
                    '<div class="modal-content">' +
                    '<div class="modal-header">' +
                    '<button type="button" class="close" aria-hidden="true" tabindex="-1">&times;</button>' +
                    '<h4>' + lang.link.insert + '</h4>' +
                    '</div>' +
                    '<div class="modal-body">' +
                    '<div class="row-fluid">' +
                    '<div class="form-group">' +
                    '<label>' + lang.link.textToDisplay + '</label>' +
                    '<input class="note-link-text form-control span12" disabled type="text" />' +
                    '</div>' +
                    '<div class="form-group">' +
                    '<label>' + lang.link.url + '</label>' +
                    '<input class="note-link-url form-control span12" type="text" />' +
                    '</div>' +
                    (!options.disableLinkTarget ?
                            '<div class="checkbox">' +
                            '<label>' + '<input type="checkbox" checked> ' +
                            lang.link.openInNewWindow +
                            '</label>' +
                            '</div>' : ''
                    ) +
                    '</div>' +
                    '</div>' +
                    '<div class="modal-footer">' +
                    '<button href="#" class="btn btn-primary note-link-btn disabled" disabled="disabled">' + lang.link.insert + '</button>' +
                    '</div>' +
                    '</div>' +
                    '</div>' +
                    '</div>';
            };

            var tplVideoDialog = function () {
                return '<div class="note-video-dialog modal" aria-hidden="false">' +
                    '<div class="modal-dialog">' +
                    '<div class="modal-content">' +
                    '<div class="modal-header">' +
                    '<button type="button" class="close" aria-hidden="true" tabindex="-1">&times;</button>' +
                    '<h4>' + lang.video.insert + '</h4>' +
                    '</div>' +
                    '<div class="modal-body">' +
                    '<div class="row-fluid">' +

                    '<div class="form-group">' +
                    '<label>' + lang.video.url + '</label>&nbsp;<small class="text-muted">' + lang.video.providers + '</small>' +
                    '<input class="note-video-url form-control span12" type="text" />' +
                    '</div>' +
                    '</div>' +
                    '</div>' +
                    '<div class="modal-footer">' +
                    '<button href="#" class="btn btn-primary note-video-btn disabled" disabled="disabled">' + lang.video.insert + '</button>' +
                    '</div>' +
                    '</div>' +
                    '</div>' +
                    '</div>';
            };

            var tplHelpDialog = function () {
                return '<div class="note-help-dialog modal" aria-hidden="false">' +
                    '<div class="modal-dialog">' +
                    '<div class="modal-content">' +
                    '<div class="modal-body">' +
                    '<a class="modal-close pull-right" aria-hidden="true" tabindex="-1">' + lang.shortcut.close + '</a>' +
                    '<div class="title">' + lang.shortcut.shortcuts + '</div>' +
                    (agent.bMac ? tplShortcutTable(lang, options) : replaceMacKeys(tplShortcutTable(lang, options))) +
                    '<p class="text-center"><a href="../hackerwins.github.io/summernote/default.htm" target="_blank">Summernote 0.5.1</a> · <a href="//github.com/HackerWins/summernote" target="_blank">Project</a> · <a href="//github.com/HackerWins/summernote/issues" target="_blank">Issues</a></p>' +
                    '</div>' +
                    '</div>' +
                    '</div>' +
                    '</div>';
            };

            return '<div class="note-dialog">' +
                tplImageDialog() +
                tplLinkDialog() +
                tplVideoDialog() +
                tplHelpDialog() +
                '</div>';
        };

        tplStatusbar = function () {
            return '<div class="note-resizebar"><div class="note-icon-bar"></div><div class="note-icon-bar"></div><div class="note-icon-bar"></div></div>';
        };
        /* jshint ignore:end */

        // createTooltip
        var createTooltip = function ($container, sPlacement) {
            $container.find('button').each(function (i, elBtn) {
                var $btn = $(elBtn);
                var tplShortcut = $btn.attr(agent.bMac ? 'data-mac-shortcut' : 'data-shortcut');
                if (tplShortcut) {
                    $btn.attr('title', function (i, v) {
                        return v + ' (' + tplShortcut + ')';
                    });
                }
                // bootstrap tooltip on btn-group bug: https://github.com/twitter/bootstrap/issues/5687
            }).tooltip({container: 'body', trigger: 'hover', placement: sPlacement || 'top'})
                .on('click', function () {
                    $(this).tooltip('hide');
                });
        };

        // pallete colors
        var aaColor = [
            ['#000000', '#424242', '#636363', '#9C9C94', '#CEC6CE', '#EFEFEF', '#F7F7F7', '#FFFFFF'],
            ['#FF0000', '#FF9C00', '#FFFF00', '#00FF00', '#00FFFF', '#0000FF', '#9C00FF', '#FF00FF'],
            ['#F7C6CE', '#FFE7CE', '#FFEFC6', '#D6EFD6', '#CEDEE7', '#CEE7F7', '#D6D6E7', '#E7D6DE'],
            ['#E79C9C', '#FFC69C', '#FFE79C', '#B5D6A5', '#A5C6CE', '#9CC6EF', '#B5A5D6', '#D6A5BD'],
            ['#E76363', '#F7AD6B', '#FFD663', '#94BD7B', '#73A5AD', '#6BADDE', '#8C7BC6', '#C67BA5'],
            ['#CE0000', '#E79439', '#EFC631', '#6BA54A', '#4A7B8C', '#3984C6', '#634AA5', '#A54A7B'],
            ['#9C0000', '#B56308', '#BD9400', '#397B21', '#104A5A', '#085294', '#311873', '#731842'],
            ['#630000', '#7B3900', '#846300', '#295218', '#083139', '#003163', '#21104A', '#4A1031']
        ];

        // createPalette
        var createPalette = function ($container) {
            $container.find('.note-color-palette').each(function () {
                var $palette = $(this), sEvent = $palette.attr('data-target-event');
                var aPaletteContents = [];
                for (var row = 0, szRow = aaColor.length; row < szRow; row++) {
                    var aColor = aaColor[row];
                    var aButton = [];
                    for (var col = 0, szCol = aColor.length; col < szCol; col++) {
                        var sColor = aColor[col];
                        aButton.push(['<button type="button" class="note-color-btn" style="background-color:', sColor,
                            ';" data-event="', sEvent,
                            '" data-value="', sColor,
                            '" title="', sColor,
                            '" data-toggle="button" tabindex="-1"></button>'].join(''));
                    }
                    aPaletteContents.push('<div>' + aButton.join('') + '</div>');
                }
                $palette.html(aPaletteContents.join(''));
            });
        };

        /**
         * create summernote layout
         *
         * @param {jQuery} $holder
         * @param {Object} options
         */
        this.createLayout = function ($holder, options) {
            //already created
            var next = $holder.next();
            if (next && next.hasClass('note-editor')) {
                return;
            }

            //01. create Editor
            var $editor = $('<div class="note-editor"></div>');
            if (options.width) {
                $editor.width(options.width);
            }

            //02. statusbar (resizebar)
            if (options.height > 0) {
                $('<div class="note-statusbar">' + tplStatusbar() + '</div>').prependTo($editor);
            }

            //03. create Editable
            var isContentEditable = !$holder.is(':disabled');
            var $editable = $('<div class="note-editable" contentEditable="' + isContentEditable + '"></div>')
                .prependTo($editor);
            if (options.height) {
                $editable.height(options.height);
            }
            if (options.direction) {
                $editable.attr('dir', options.direction);
            }

            $editable.html(dom.html($holder) || dom.emptyPara);

            //031. create codable
            $('<textarea class="note-codable"></textarea>').prependTo($editor);

            var langInfo = $.summernote.lang[options.lang];

            //04. create Toolbar
            var sToolbar = '';
            for (var idx = 0, sz = options.toolbar.length; idx < sz; idx++) {
                var group = options.toolbar[idx];
                sToolbar += '<div class="note-' + group[0] + ' btn-group">';
                for (var i = 0, szGroup = group[1].length; i < szGroup; i++) {
                    sToolbar += tplToolbarInfo[group[1][i]](langInfo);
                }
                sToolbar += '</div>';
            }

            sToolbar = '<div class="note-toolbar btn-toolbar">' + sToolbar + '</div>';

            var $toolbar = $(sToolbar).prependTo($editor);
            createPalette($toolbar);
            createTooltip($toolbar, 'bottom');

            //05. create Popover
            var $popover = $(tplPopover(langInfo)).prependTo($editor);
            createTooltip($popover);

            //06. handle(control selection, ...)
            $(tplHandle()).prependTo($editor);

            //07. create Dialog
            var $dialog = $(tplDialog(langInfo, options)).prependTo($editor);
            $dialog.find('button.close, a.modal-close').click(function () {
                $(this).closest('.modal').modal('hide');
            });

            //08. create Dropzone
            $('<div class="note-dropzone"><div class="note-dropzone-message"></div></div>').prependTo($editor);

            //09. Editor/Holder switch
            $editor.insertAfter($holder);
            $holder.hide();
        };

        /**
         * returns layoutInfo from holder
         *
         * @param {jQuery} $holder - placeholder
         * @returns {Object}
         */
        this.layoutInfoFromHolder = function ($holder) {
            var $editor = $holder.next();
            if (!$editor.hasClass('note-editor')) {
                return;
            }

            var layoutInfo = dom.buildLayoutInfo($editor);
            // cache all properties.
            for (var key in layoutInfo) {
                if (layoutInfo.hasOwnProperty(key)) {
                    layoutInfo[key] = layoutInfo[key].call();
                }
            }
            return layoutInfo;
        };

        /**
         * removeLayout
         *
         * @param {jQuery} $holder - placeholder
         */
        this.removeLayout = function ($holder) {
            var info = this.layoutInfoFromHolder($holder);
            if (!info) {
                return;
            }
            $holder.html(info.editable.html());

            info.editor.remove();
            $holder.show();
        };
    };

    // jQuery namespace for summernote
    $.summernote = $.summernote || {};

    // extends default `settings`
    $.extend($.summernote, settings);

    var renderer = new Renderer();
    var eventHandler = new EventHandler();

    /**
     * extend jquery fn
     */
    $.fn.extend({
        /**
         * initialize summernote
         *  - create editor layout and attach Mouse and keyboard events.
         *
         * @param {Object} options
         * @returns {this}
         */
        summernote: function (options) {
            // extend default options
            options = $.extend({}, $.summernote.options, options);

            this.each(function (idx, elHolder) {
                var $holder = $(elHolder);

                // createLayout with options
                renderer.createLayout($holder, options);

                var info = renderer.layoutInfoFromHolder($holder);
                eventHandler.attach(info, options);

                // Textarea: auto filling the code before form submit.
                if (dom.isTextarea($holder[0])) {
                    $holder.closest('form').submit(function () {
                        $holder.html($holder.code());
                    });
                }
            });

            // focus on first editable element
            if (this.first() && options.focus) {
                var info = renderer.layoutInfoFromHolder(this.first());
                info.editable.focus();
            }

            // callback on init
            if (this.length > 0 && options.oninit) {
                options.oninit();
            }

            return this;
        },
        //

        /**
         * get the HTML contents of note or set the HTML contents of note.
         *
         * @param {String} [sHTML] - HTML contents(optional, set)
         * @returns {this|String} - context(set) or HTML contents of note(get).
         */
        code: function (sHTML) {
            // get the HTML contents of note
            if (sHTML === undefined) {
                var $holder = this.first();
                if ($holder.length === 0) {
                    return;
                }
                var info = renderer.layoutInfoFromHolder($holder);
                if (!!(info && info.editable)) {
                    var bCodeview = info.editor.hasClass('codeview');
                    if (bCodeview && agent.bCodeMirror) {
                        info.codable.data('cmEditor').save();
                    }
                    return bCodeview ? info.codable.val() : info.editable.html();
                }
                return $holder.html();
            }

            // set the HTML contents of note
            this.each(function (i, elHolder) {
                var info = renderer.layoutInfoFromHolder($(elHolder));
                if (info && info.editable) {
                    info.editable.html(sHTML);
                }
            });

            return this;
        },

        /**
         * destroy Editor Layout and dettach Key and Mouse Event
         * @returns {this}
         */
        destroy: function () {
            this.each(function (idx, elHolder) {
                var $holder = $(elHolder);

                var info = renderer.layoutInfoFromHolder($holder);
                if (!info || !info.editable) {
                    return;
                }
                eventHandler.dettach(info);
                renderer.removeLayout($holder);
            });

            return this;
        }
    });
}));
